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-   -   Hankook Ventus V12 Evo (https://www.rx7club.com/suspension-wheels-tires-brakes-20/hankook-ventus-v12-evo-892043/)

Rx72Heaven 03-11-10 07:24 PM

Hankook Ventus V12 Evo
 
So been doing a little bit more research.. i was going to go for the Star Spec Z1 tires for my rims this summer. But upon more digging around, i came across these awesome tires, with a amazing price tag attached. Check out this in-depth review.... :icon_tup:

http://www.caranddriver.com/reviews/...mparison_tests


The Star spec's came out on top, but not by a alot, followed by the V12 Evo's. And the Evo's being 50 dollars cheaper per tire, im going to buy these come Monday. Ill post my review on these, but by the rave reviews, im sure ill love them.

-mark

Mahjik 03-12-10 03:22 PM

They are a very good tire for the money. Many people in the BMW crowd have used them. The tread pattern isn't as aggressive as some of the tires offered today, but the performance is good.

rdgt99 03-12-10 06:44 PM

I was interested in these also for the price after reading the article in Car&Driver. Definitely let us know how it turns out.

rx7/24/7 03-14-10 08:24 AM

i ran the old ventus tire from hankook (rs2z212) it was amazing. i have not used the new one but the old one was super grippy. i had them on my old ep3 civic, lot of grip even with fwd. hankook ftw!!!!!

estevan62274 03-14-10 09:58 AM


Originally Posted by Rx72Heaven (Post 9861700)
So been doing a little bit more research.. i was going to go for the Star Spec Z1 tires for my rims this summer. But upon more digging around, i came across these awesome tires, with a amazing price tag attached. Check out this in-depth review.... :icon_tup:

http://www.caranddriver.com/reviews/...mparison_tests


The Star spec's came out on top, but not by a alot, followed by the V12 Evo's. And the Evo's being 50 dollars cheaper per tire, im going to buy these come Monday. Ill post my review on these, but by the rave reviews, im sure ill love them.

-mark



^
I ordered a set for my FD... they are sitting in my garage right now.
I hope to get them installed this week. I'll let you what i think about them.
235/40/18 fronts and 265/35/18 rears

I'm very excited about these tires :)
Can't beat the price.
Steve

Rx72Heaven 03-14-10 07:22 PM

Yea there supposed to be one hell of a tire! ill be putting my order in tomorrow... and once installed on my ms-01's ill let ya know what i think!

Josh18_2k 03-14-10 10:01 PM

seems too good to be true. the only test ive seen is that C&D review, so I'm gonna stay skeptical until some more stuff comes out.

LargeOrangeFont 03-14-10 10:26 PM

NT05s were not in that test either... that is odd.

Rx72Heaven 03-15-10 03:41 PM


Originally Posted by LargeOrangeFont (Post 9867644)
NT05s were not in that test either... that is odd.

They set a certain price point for the tires.

DeeSan 03-15-10 03:55 PM

1 Attachment(s)
Attachment 759267

just got my set :) can't wait to receive my new set of wheels and try them out!

I'll be running the following sizes:

Front : 18 x 9.5 - 245/35/18
Rear : 18 x 11 - 295/30/18

I'll report back when I get to spin em!

LargeOrangeFont 03-15-10 05:19 PM


Originally Posted by Rx72Heaven (Post 9869143)
They set a certain price point for the tires.

NT05s are cheaper than the Dunlops.

HotRodMex 03-16-10 08:20 PM


Originally Posted by LargeOrangeFont (Post 9867644)
NT05s were not in that test either... that is odd.

Nor the RE-11, nor the RS-3... They stuck with the 225/45/17 tire, of which these are not made.


Originally Posted by Rx72Heaven (Post 9861700)
The Star spec's came out on top, but not by a alot, followed by the V12 Evo's. And the Evo's being 50 dollars cheaper per tire, im going to buy these come Monday. Ill post my review on these, but by the rave reviews, im sure ill love them.

I don't doubt they perform well as a great street tire, but I don't think it's fair to make it seem like the Dunlops aren't worth the money. .5 seconds on a 60 second auto-x course is nothing to scoff at. Also, the Dunlop is fully capable of being a track tire, whereas the Hankook would likely dissolve after a lap or two.


All that being said I've been looking at these tires to put on the 7 for "fun" duty, but only because I'll be stepping up to V710s for auto-x.

neit_jnf 03-23-10 10:17 AM

I just got a set to replace my Falkens FK451 on RZ wheels

17x8 Front 245/40-17
17x8.5 Rear 255/40-17

As long as they perform as well and last as long as the Falkens I'll be happy.

speedjunkie 07-11-10 02:48 AM

So, anyone have any reviews on these? I'm kinda looking to pick up some 255/35 for 9.5 and 295/30 for 10.5 and wondering how these would fit, and also how you guys like them.

Sandrock 07-12-10 05:51 PM

I have them on my FD. AWESOME tires. you wont be disappointed.

neit_jnf 07-13-10 10:49 AM


Originally Posted by neit_jnf (Post 9886684)
I just got a set to replace my Falkens FK451 on RZ wheels

17x8 Front 245/40-17
17x8.5 Rear 255/40-17

As long as they perform as well and last as long as the Falkens I'll be happy.


I've had them for some time now. Compared to the Falkens I had before i feel like they stick better so I can turn faster and they don't break loose as easily.

Could be a new tire vs bald tire thing though...

Mahjik 07-13-10 12:48 PM


Originally Posted by neit_jnf (Post 10107398)
Could be a new tire vs bald tire thing though...

Naw, they are definitely a better tire than the FK451's.

ElPhantasmo 07-13-10 05:01 PM

I have a set on my STi in 255/35/18. So far, so good. Its a pretty quiet tire as well. I was between these and the star specs and the price sealed it for me. Pretty happy with the performance as well.

donrafa7 12-14-12 10:14 PM

hate to bring this up from the dead but what pressure are you guys running for track on these, reviving this thread cuz everyone always says "search, search"

SonicFD 12-18-12 12:06 AM

^ I wouldn't use Hankook V12 EVO on the track. RS3 sure but not V12.

Valkyrie 12-18-12 12:17 AM

The Ventus V12 Evo is a summer tire for daily driving. The Star Spec is a high-performance street tire designed for driving on the track and autocross. They're two completely different animals. The pattern, compound, and sidewall stiffness is all very different.

The RS3 is a better choice for a hard-core sports car fan if you care about price. The Ecsta XS would be similar. Ignoring price, the Dunlops are better. Bridgestones and Advans are just... expensive.

Dollar for dollar, the Federal RS-R is an even better deal, and the performance is almost as good as any similar tire that costs twice as much.

Less aggressive tires like the Federal SS595, the V12, or the BF-G G-Force will last longer, be quieter, and be slightly cheaper, though. But I wouldn't want to autocross or do a track day on them if I didn't have to.

Mahjik 12-18-12 09:05 AM


Originally Posted by donrafa7 (Post 11317383)
hate to bring this up from the dead but what pressure are you guys running for track on these, reviving this thread cuz everyone always says "search, search"


A good place to start is around 30 PSI. Run that for a session and evaluate if you need to go lower or higher.

eage8 12-18-12 01:04 PM


Originally Posted by Mahjik (Post 11320316)
A good place to start is around 30 PSI. Run that for a session and evaluate if you need to go lower or higher.

I recently ran a track day in my Subaru on Continental Extreme contact DWs which are pretty similar tires (My corolla's brake master cylinder failed the day before on track and my rx7 was in pieces...)

I started chalking my tires at running 30 psi, at the end of the day I was around 50 psi front and 40 psi rear...

subarus are pretty front heavy and I was on stock springs and sways so you're results may very... but 30 psi is probably going to be way too low.

bring some chalk to the track and chalk your tires shoulders in a few places, adjust your tires until they're rolling over the right amount so you're using all the tire, but none of the sidewall.


and yes you can track them, they're not ideal, but again, neither are any street tires. they'll be a lot better than all seasons. have fun, and be safe.

donrafa7 12-18-12 01:25 PM

Thanks for all the replies. I just couldnt pass up a great deal I got (240 shipped ). Dont have spare wheels so I gotta take these to the track. Im a total noob to track so nit having super tires should be good for me.

Mahjik 12-18-12 03:39 PM


Originally Posted by eage8 (Post 11320565)
I recently ran a track day in my Subaru on Continental Extreme contact DWs which are pretty similar tires (My corolla's brake master cylinder failed the day before on track and my rx7 was in pieces...)

I started chalking my tires at running 30 psi, at the end of the day I was around 50 psi front and 40 psi rear...

subarus are pretty front heavy and I was on stock springs and sways so you're results may very... but 30 psi is probably going to be way too low.

For the FD, not a Subaru, 30 (cold) is a pretty common starting point:

https://www.rx7club.com/suspension-w...7/#post8007013

For Victoracers, I start with 28 cold.

eage8 12-18-12 10:23 PM


Originally Posted by Mahjik (Post 11320704)
For the FD, not a Subaru, 30 (cold) is a pretty common starting point:

https://www.rx7club.com/suspension-w...7/#post8007013

For Victoracers, I start with 28 cold.


I realize... but his sidewalls are going to be quite a bit softer than a set of Victoracers. driving around on your sidewalls isn't terribly fun... He's not running pretty common track tires.

My intention was simply to help him in the right direction and recommend that he starts off chalking his tires.

(PS, my pressures were hot)

silverTRD 12-21-12 03:35 PM

the federal rsr's are not recommended for street use even though they are dot approved and do have a tread rating which is 140. just an fyi, that being said im still interested in them even for street use. lol

Valkyrie 12-21-12 04:51 PM

^that's crap, they're street tires. I've been using them for most of a year, and I have put about 7-8 track days on them. I do need new rears though (it's an MR-2).

Valkyrie 12-21-12 04:56 PM


Originally Posted by eage8 (Post 11321136)
I realize... but his sidewalls are going to be quite a bit softer than a set of Victoracers. driving around on your sidewalls isn't terribly fun... He's not running pretty common track tires.

My intention was simply to help him in the right direction and recommend that he starts off chalking his tires.

(PS, my pressures were hot)

Having the biggest possible contact patch is more important than having absolutely no sidewall flex.

Which is why using a pyrometer is something actual race teams do and why chalking tires is something that amateur autocrossers do.

eage8 12-21-12 10:27 PM


Originally Posted by Valkyrie (Post 11323465)
Having the biggest possible contact patch is more important than having absolutely no sidewall flex.

Which is why using a pyrometer is something actual race teams do and why chalking tires is something that amateur autocrossers do.

so your suggestions is for him to get a $100 pyrometer for his street tires?

unless you're checking your tire temps in pit lane, it's not terribly helpful. They cool down a good bit by the time you get back to where you're parked.

I have a pyrometer and didn't even bother using it, because they're street tires and it's not worth the hassle.

Here is a picture of my tire almost debeading at 30psi...
http://www.catesracing.com/flp/nasa/...1/IMG_6756.JPG

Josh18_2k 12-21-12 11:28 PM

you really cant just issue a blanket statement like "FD's want 30psi." Totally depends on the tire and camber. If you don't have enough camber, you will need more pressure. And every tire is different and requires different pressures. eg: V710's need 5-10psi less than A6's.

Most high performance street tires (140-200TW) need 32-38 (hot) with proper camber. If you have less than 2* up front, chances are that will be up over 40.

Mahjik 12-22-12 10:12 PM


Originally Posted by Josh18_2k (Post 11323740)
you really cant just issue a blanket statement like "FD's want 30psi."

And no one did. The statement was: "A good place to start is around 30 PSI."

Granted, should have added "cold" but seeing as the person posted the question is just learning, introducing hot verses cold didn't seem appropriate. I still contend that for the FD, 30 PSI is the place to start and adjust up/down based on whatever reading being used (pyrometer, chalk, butt, etc).

FWIW, on my M3 I use much higher pressures when it does hit the track. I wouldn't dream of running 30 PSI for anything on that car. As Josh mentions, there will be different settings for different cars, tires, suspension setups, etc.

rx7dreamweaver 01-12-13 11:43 PM

I had a set on my 350z, and hands down the most incredible tire i've owned. Incredible grip, very quiet, handled all the weather i threw at it, including tremendous amounts of snow. plus, stacked meaty look... i'll see if i have a pic or two. Had the guy I bought my FD from not just put on brand new tires, i'd be rolling a set again. Will when I put new rims on for sure.

lOOkatme 01-16-13 09:52 PM


Originally Posted by Valkyrie (Post 11323465)
Having the biggest possible contact patch is more important than having absolutely no sidewall flex.

Which is why using a pyrometer is something actual race teams do and why chalking tires is something that amateur autocrossers do.

Actually you are wrong here.

Its more important to have wide wheels with a stretched tire than it is to have wider tires.

Look at any car racing. They are fitting tires with a stretch in them. 245's on 9.5" width, 255's on 10", 265 on 10.5" and 295 on 11" width.

The stretch is the most important thing when it comes to handling of the car. They have noticed that running wider wheels regardless of weight drops times. Each 1" width increase has shown second faster lap times on minute-2 minute tracks. They have seen multiple second increased when going up inches in width.

Some people say that the wheel width should match the tread width or so, which is also a pretty good rule of thumb.

Here are a couple of articles to ponder.

URGE designs

http://www.cb-racing.com/PilotCup_Presentation.PPT (look at slide 34 and the few after)


Wheel Specs on a cup car for 2013


18x9.5 front, tire is 237MM or 9.3 wide
18x12 rear, tire is 292MM or 11.5 wide

set ups

Sierra Sierra EVO
Wheels/Tires 18x10.5 +22 Rays Engineering Volk Racing CE28N; 295/30/18 Ventus TD (C71 compound)

tread width = 10.5" on the 295" tire.

Revolution RX7
Wheels/Tires: Volk Racing RE30 18x9.5 (front) 18x10.5 (rear) wheels; Hankook Ventus RSS 265/35 (front) 285/30 (rear) tires
Tread width of the hankook TD below
265 = 9.5"
285 = 10.3"


I can't find a single team that races or sports car that handles well that puts a tire on the wheel which has a larger tread width then wheel width.

So the largest tire fitted to a wheel does NOT perform better. otherwise you would see it all over racing.

GoodfellaFD3S 01-16-13 10:25 PM


Originally Posted by rx7dreamweaver (Post 11343405)
I had a set on my 350z, and hands down the most incredible tire i've owned. Incredible grip, very quiet, handled all the weather i threw at it, including tremendous amounts of snow. plus, stacked meaty look... i'll see if i have a pic or two. Had the guy I bought my FD from not just put on brand new tires, i'd be rolling a set again. Will when I put new rims on for sure.

They're quality tires for daily driver duty.....but if you think they have incredible grip, you just haven't sampled the top tier of street tires that are out there---AD08, Star Spec, RE-11, and I'll even throw in the RS3 for the Hankook fanboys ;) :rofl:

Valkyrie 01-17-13 05:11 AM


Originally Posted by lOOkatme (Post 11347356)
Actually you are wrong here.

Its more important to have wide wheels with a stretched tire than it is to have wider tires.

Look at any car racing. They are fitting tires with a stretch in them. 245's on 9.5" width, 255's on 10", 265 on 10.5" and 295 on 11" width.

The stretch is the most important thing when it comes to handling of the car. They have noticed that running wider wheels regardless of weight drops times. Each 1" width increase has shown second faster lap times on minute-2 minute tracks. They have seen multiple second increased when going up inches in width.

Some people say that the wheel width should match the tread width or so, which is also a pretty good rule of thumb.

Here are a couple of articles to ponder.

URGE designs

http://www.cb-racing.com/PilotCup_Presentation.PPT (look at slide 34 and the few after)


Wheel Specs on a cup car for 2013


18x9.5 front, tire is 237MM or 9.3 wide
18x12 rear, tire is 292MM or 11.5 wide

set ups

Sierra Sierra EVO
Wheels/Tires 18x10.5 +22 Rays Engineering Volk Racing CE28N; 295/30/18 Ventus TD (C71 compound)

tread width = 10.5" on the 295" tire.

Revolution RX7
Wheels/Tires: Volk Racing RE30 18x9.5 (front) 18x10.5 (rear) wheels; Hankook Ventus RSS 265/35 (front) 285/30 (rear) tires
Tread width of the hankook TD below
265 = 9.5"
285 = 10.3"


I can't find a single team that races or sports car that handles well that puts a tire on the wheel which has a larger tread width then wheel width.

So the largest tire fitted to a wheel does NOT perform better. otherwise you would see it all over racing.

Durrr, I was talking about tire pressure, not wheel size.

lOOkatme 01-17-13 10:17 AM


Originally Posted by Valkyrie (Post 11347587)
Durrr, I was talking about tire pressure, not wheel size.

Ok. my bad. I thought you were talking about having the widest tires possible.

The best set up I have seen in anything I have read, seen, felt is widest wheels with tires that are slightly stretched on the wheels.

BLUE TII 01-17-13 01:21 PM

Dollar for dollar, the Federal RS-R is an even better deal, and the performance is almost as good as any similar tire that costs twice as much.

the federal rsr's are not recommended for street use even though they are dot approved and do have a tread rating which is 140. just an fyi, that being said im still interested in them even for street use. lol

Dollar for dollar, the Federal RS-R is an even better deal, and the performance is almost as good as any similar tire that costs twice as much.

I want to post my experiences with the Federal 595RS-R since it has been brought up a couple times.

I put 265/35-18 RS-Rs on my FDs 18x10.5 wheels for my clubs first autocross points event 9 months ago.

I won the street tire award every single event.

I was in the top 5 for pax and overall points against miatas, Stis, EvoXs on autocross slicks (Hoosiers A6, Kumho V710, Hankook Z214 C71.)

They are $140 for the 265/35-18- very cheap for that size.

They are the longest lasting tire I have used for mixed autocross and street driving. They are now near the wear bars, but I am starting this years pre-season event this weekend on them.

They are my favorite tire I have used on the street. For a max performance summer tire they are predictable as they work reasonably in cooler temperatures and don't go to super hero grip when warmed.

They are not however a refined tire.

The tread splice always separates some leaving what looks like a gash across the tires surface.

They require lots of weights when new because they are so out of round/off weight. Once they wear down the weight is off. Its probably best to run these without balancing or rebalance once they are worn in.

They are loud.

They don't grip very well when the pavement is below 50 degrees, but much better than the Hankook RS-3 I used before.

Valkyrie 01-17-13 02:25 PM


Originally Posted by lOOkatme (Post 11347712)
Ok. my bad. I thought you were talking about having the widest tires possible.

The best set up I have seen in anything I have read, seen, felt is widest wheels with tires that are slightly stretched on the wheels.

I don't disagree. OTOH, simply using low-profile tires with light wheels gives the same affect.

The difference in response and feel of stability between my 17" RS-Rs and my 15" snow tires is massive. And it's not just a matter of grip. It's all from sidewall flex.

lOOkatme 01-17-13 05:10 PM


Originally Posted by Valkyrie (Post 11348002)
I don't disagree. OTOH, simply using low-profile tires with light wheels gives the same affect.

The difference in response and feel of stability between my 17" RS-Rs and my 15" snow tires is massive. And it's not just a matter of grip. It's all from sidewall flex.

I see a lot of people putting very wide tires on not as wide wheels, which doesn't give you the performance they think they are getting.

I see a lot of people putting 285's on 10" wide wheels. Most 285 tires are too wide for a 10" wheel.

If you want a stretch to the tire you want the tread width to be around the wheel width.

here are some tire tread widths off tirerack

255/35/18
RE-11 9.4" (9.5 or 10" wheel)
R-S3 9.5" (0.5" or 10" wheel)
R1R 9.3" (9.5" wheel)
AD08 9.9" (10" wheel)

265/35/18
RE-11 9.6" (10" wheel)
R-S3 9.4" (9.5" wheel)
AD08 10.3" (10.5" wheel)

285/30/18
AD08 11" (11" wheel)
Hankook TD 10.3" (10.5" wheel)
595 RSR 10.2" (10.5" wheel)

I just want to point out some tire sizes in 265 are wider/as wide as 285's. So people need to be careful when selecting tire widths and wheel widths not to overdo it. Just because you have a wider tire might not mean you have better grip and handling.

ringo_rx7 01-17-13 10:12 PM

bumppppppppppp

Valkyrie 01-17-13 10:41 PM


Originally Posted by lOOkatme (Post 11348151)
I see a lot of people putting very wide tires on not as wide wheels, which doesn't give you the performance they think they are getting.

I see a lot of people putting 285's on 10" wide wheels. Most 285 tires are too wide for a 10" wheel.

If you want a stretch to the tire you want the tread width to be around the wheel width.

here are some tire tread widths off tirerack

255/35/18
RE-11 9.4" (9.5 or 10" wheel)
R-S3 9.5" (0.5" or 10" wheel)
R1R 9.3" (9.5" wheel)
AD08 9.9" (10" wheel)

265/35/18
RE-11 9.6" (10" wheel)
R-S3 9.4" (9.5" wheel)
AD08 10.3" (10.5" wheel)

285/30/18
AD08 11" (11" wheel)
Hankook TD 10.3" (10.5" wheel)
595 RSR 10.2" (10.5" wheel)

I just want to point out some tire sizes in 265 are wider/as wide as 285's. So people need to be careful when selecting tire widths and wheel widths not to overdo it. Just because you have a wider tire might not mean you have better grip and handling.

You might not have better handling (balance!!!), but for the most part you will almost always get more grip. Of course, if you use too small of a wheel your tire shop will either tell you to piss off, or they will HATE you for it.

That's assuming you are going fast enough to get and keep heat in the tires, of course.

But other than weighing too much and having too much drag for your power level, the only reason not to use wider tires and wheels is the rules, your fenders, and your budget.

lOOkatme 01-20-13 08:59 AM


Originally Posted by Valkyrie (Post 11348453)
You might not have better handling (balance!!!), but for the most part you will almost always get more grip. Of course, if you use too small of a wheel your tire shop will either tell you to piss off, or they will HATE you for it.

That's assuming you are going fast enough to get and keep heat in the tires, of course.

But other than weighing too much and having too much drag for your power level, the only reason not to use wider tires and wheels is the rules, your fenders, and your budget.

Wrong, you will not have more grip fitting a larger tire on a wheel width that is too small. The mechanical grip goes down and so does the traction. If you do this on the front of the car you will end up with understeer, if you drop a tire size so you have a slight stretch, your mechanical grip goes up and the understeer will go away.

Grip goes down when you put a larger tire on a skinny wheel.

Valkyrie 01-20-13 04:17 PM

^no it doesn't (as long as you're within the approved rim width range)

GoodfellaFD3S 01-20-13 06:06 PM


Originally Posted by lOOkatme (Post 11350508)
Grip goes down when you put a larger tire on a skinny wheel.

So a 275mm on an 11 inch yields more than a 275 on a 10? Please cite your sources :)

eage8 01-20-13 08:11 PM


Originally Posted by lOOkatme (Post 11350508)
Wrong, you will not have more grip fitting a larger tire on a wheel width that is too small. The mechanical grip goes down and so does the traction. If you do this on the front of the car you will end up with understeer, if you drop a tire size so you have a slight stretch, your mechanical grip goes up and the understeer will go away.

Grip goes down when you put a larger tire on a skinny wheel.

every stock class autocrosser disagrees with you.

lOOkatme 01-20-13 10:47 PM


Originally Posted by GoodfellaFD3S (Post 11350909)
So a 275mm on an 11 inch yields more than a 275 on a 10? Please cite your sources :)

Look at any race team...look at spec miata's. look at the racing world and the wheels/tires they use.

They ALL run wheels wider than the tread width of the tire. The times come down and they run faster lap times.

So racers who have a 10" wheel CHOOSE a 255 or 265 width tire OVER a 275/285 width tire because it produces faster lap times.

Now I am not 100% sure that a 285 on a 10" wheel vrs. a 265 on a 10" wheel doing a skidpad what the actual peak limit result will be. I do know that racers all choose the 265 over the 285 on a 10" wheel.


I will challenge anyone to find me a time attack car, a lemans car, a porsche race car, etc, etc that runs a tire width wider than the wheel width then we can start arguing.

If grip went up by running wider tires than wheel widths and it were controllable, then racers would run that.

lOOkatme 01-20-13 11:02 PM


Originally Posted by GoodfellaFD3S (Post 11350909)
So a 275mm on an 11 inch yields more than a 275 on a 10? Please cite your sources :)

Yes, Where .5" increase in wheel width increases the tread contact patch by .2.


Straight from Yokohama
"The dimension that changes the most is the tire's section width—a change of about 0.2" for every 0.5" change in rim width."

Performance Tire Wheel Relationship | Yokohama Tire Corp.

Tirerack
"The industry rule of thumb is that for every 1/2" change in rim width, the tire's section width will correspondingly change by approximately 2/10"."

Tire Tech Information - Tire Specs Explained: Section Width


Michelin Engineers

"Bigger isn’t always better, both in terms of ease of driving and in terms of lap times.
Frequently, the tire looks “stretched out” on the application wheel, forming what looks to be a “trapezoidal” cross-section, with the tread width close to or less than the width of the tire’s beads. This is because of the simple fact that a “high-tension” tire shape is more efficient, in most cases, than a fat, “low-tension” shape."

www.cb-racing.com/PilotCup_Presentation.PPT


Grip is relative to handling..... and I am talking about grip in corners not straight away.

Valkyrie 01-21-13 01:11 AM

You are confusing section width with contact patch size. Section width is how wide the whole tire is, which is relevant...in suspension and fender clearance issues. But it doesn't effect grip or handling. Only the sidewalls and contact patch do.

Bigger isn't always better, but using a wider tire does NOT decrease grip.

285s weight more, cost more, and require more space than 265s. There are plenty of reasons NOT to increase tire size, but there is only one reason to increase it: more grip.

Sometimes in a short race, it's more important for tires to quickly reach their peak operating temperatures and be as light as possible rather than having as much meat as possible.

What Spec Miata does and what F1 does is not relevant. Spec Miata is a tightly-controlled spec class and people will do ANYTHING that they (think) gives them an advantage that is within the rules. F1 is the world's most expensive sport and the tires used are not even in the same galaxy as regular racing tires.

Not to mention that handling is not as simple as weight and grip. The only real advantage that stretching tires gives is more response, which in some cases is advantageous, in some it is not. It's just one variable that can be changed to change how a car handles. In some cases too much response and not enough compliance means you lose grip (the car skates across the track).

The fact of the matter is that you stated that wider tires means less grip, which is false.

lOOkatme 01-21-13 04:00 PM


Originally Posted by Valkyrie (Post 11351225)
You are confusing section width with contact patch size. Section width is how wide the whole tire is, which is relevant...in suspension and fender clearance issues. But it doesn't effect grip or handling. Only the sidewalls and contact patch do.

Bigger isn't always better, but using a wider tire does NOT decrease grip.

285s weight more, cost more, and require more space than 265s. There are plenty of reasons NOT to increase tire size, but there is only one reason to increase it: more grip.

Sometimes in a short race, it's more important for tires to quickly reach their peak operating temperatures and be as light as possible rather than having as much meat as possible.

What Spec Miata does and what F1 does is not relevant. Spec Miata is a tightly-controlled spec class and people will do ANYTHING that they (think) gives them an advantage that is within the rules. F1 is the world's most expensive sport and the tires used are not even in the same galaxy as regular racing tires.

Not to mention that handling is not as simple as weight and grip. The only real advantage that stretching tires gives is more response, which in some cases is advantageous, in some it is not. It's just one variable that can be changed to change how a car handles. In some cases too much response and not enough compliance means you lose grip (the car skates across the track).

The fact of the matter is that you stated that wider tires means less grip, which is false.

I agree that I mixed up section width and tread width the way I was quoting and reading it.

A wider wheel with a stretch effects the slip angle of the tire. The two largest effects on grip are pressure and slip angle. And from what I have read the carcass regidity increases with a stiffer sidewall effecting the efficiency of the tire and the grip.

The larger tire on a smaller width wheel (think 8.5" 255 width) has less carcuss rigidity and worse slip angles than a (8.5" 225 width). I don't know the exact grip difference between the two tires on let's say a skidpad test or a slalon test, but the times on a race track drop when using the 225 width tire on the 8.5" wheel than a 255 width.

So usable grip goes up. This is definitely seen when using a 255 width and moving from a wheel width from a 8.5" to a 10" wheel. You can get a negative effect if the wheel is too wide as it changes the shape of the tread and less contact will be had with the road.

I can't find any good answers to which has more grip, but I do know that just about all the professionally tuned cars run wider wheel widths than tread widths and have a slight stretch to the tires. I have also experienced this first hand myself when setting up my car.


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