what wheel sizes and tires do all you road racers run?
12-30-02, 06:59 PM
#51
Lives on the Forum
Carl has good points. I think Brad (and I) prefer to use rim widths on the wider end of the rim width range of most tire specs.
So while Kumho states 9 to 11 inches as a usable rim width range for a 275/40-17, Brad and I would go for the 10.5/11.0 inch rim widths to maximize the contact patch offered up by Kumho's Victoracer's 275/40-17 size (which is rather wide as 275/40-17s go!
)
Interestingly, Hoosier's 275/40-17 R3S03 is rather "narrow" as 275/40-17s go; they would be very happy on 10s. I ran 9.5 s last season with Hoosier 275/40-17s, and I think I need 10s to really make those 275/40-17 R3S03s smile
FWIW, John Purner of CCW also recommends a "wider" rim up front and a "narrower" rim in back for excellent turn-in and gradual break away, just as the SCC folks had mentioned in their article
I'll working with John Purner now for a set of CCW mesh in street trim with black anodized centers. I'll report back with what John Purner recommends for stock outer diameter springs (I have H&R).
So while Kumho states 9 to 11 inches as a usable rim width range for a 275/40-17, Brad and I would go for the 10.5/11.0 inch rim widths to maximize the contact patch offered up by Kumho's Victoracer's 275/40-17 size (which is rather wide as 275/40-17s go!
) Interestingly, Hoosier's 275/40-17 R3S03 is rather "narrow" as 275/40-17s go; they would be very happy on 10s. I ran 9.5 s last season with Hoosier 275/40-17s, and I think I need 10s to really make those 275/40-17 R3S03s smile
FWIW, John Purner of CCW also recommends a "wider" rim up front and a "narrower" rim in back for excellent turn-in and gradual break away, just as the SCC folks had mentioned in their article
I'll working with John Purner now for a set of CCW mesh in street trim with black anodized centers. I'll report back with what John Purner recommends for stock outer diameter springs (I have H&R).
Originally posted by in2twins
Brad, I have the utmost respect for your opinion, but in looking at both the Hoosier, and the Kumho sites, the 275-40-17 measured rim width for both brands is 9.5". It seems to me that given this, a 9.5" rim is certainly not pinching the tire. On the Kumho, which I have on my Supra(17x9.5"),the sidewall of the 275 is both straight, and vertical. It behaves predictably, and shows perfect temps across the tread. Kumho lists 9-11" as usable rim width. The Hoosier as most of us know is a little different story, as they tend to like a little larger rim, still hoosier lists this tire as having a 9.5" rim width(9.5-11 usable). There was a nice article recently in Sport Compact, that talked about using various rim widths on the same size tire to vary the turn in and break away characteristics of a given tire size. One suspension tuner was using a wider rim on the front, for a vertical sidewall, and good turn in. On the rear they used a narrower rim, for a slightly rounded sidewall, and more gradual break away. Granted there are other ways to accomplish the same thing, but ity does represent another tool for getting the car just right. On a side note, I believe someone on the forum has run the 9.5" Supra rims on an FD. Does anyone know what's required to accomplish that? I would like to run these all the way around on my FC with 275-40-17s. (Already working on the widebody). Best regards, Carl Byck
Brad, I have the utmost respect for your opinion, but in looking at both the Hoosier, and the Kumho sites, the 275-40-17 measured rim width for both brands is 9.5". It seems to me that given this, a 9.5" rim is certainly not pinching the tire. On the Kumho, which I have on my Supra(17x9.5"),the sidewall of the 275 is both straight, and vertical. It behaves predictably, and shows perfect temps across the tread. Kumho lists 9-11" as usable rim width. The Hoosier as most of us know is a little different story, as they tend to like a little larger rim, still hoosier lists this tire as having a 9.5" rim width(9.5-11 usable). There was a nice article recently in Sport Compact, that talked about using various rim widths on the same size tire to vary the turn in and break away characteristics of a given tire size. One suspension tuner was using a wider rim on the front, for a vertical sidewall, and good turn in. On the rear they used a narrower rim, for a slightly rounded sidewall, and more gradual break away. Granted there are other ways to accomplish the same thing, but ity does represent another tool for getting the car just right. On a side note, I believe someone on the forum has run the 9.5" Supra rims on an FD. Does anyone know what's required to accomplish that? I would like to run these all the way around on my FC with 275-40-17s. (Already working on the widebody). Best regards, Carl Byck
12-31-02, 11:15 AM
#52
Full Member
Join Date: Aug 2002
Location: on track
Posts: 248
Likes: 0
Received 0 Likes
on
0 Posts
Carl,
Good points you raise, thanks. Without looking at the charts and working from a defective memory <g>, I would usually go with tire manufacturers data. Don't forget what is meant by 'measured width', i.e a 10" wheel can actually be a measured 9.5". All of this can be really confusing, can't it?
Going back to the manufacturer's data, different construction methods ask for different sidewall angle specs and recommended wheel widtsh. A big heavy Kuhmo or Yok A032r can almost run flat on the sidewalls, while a Hoo-hoo is much more flexible. My Dunlop slicks are very weak inthe sidewall as are most slicks and need correct measured wheel widths to work perfectly.
As for the advice on different sizes to induce smooth breakaway, I prefer to do my suspension tuning by other means: Spring rates, air pressures, aero, shock rebound/compression and sway bars. These things are easily, relatively cheaply and quickly changed as opposed to wheel width and offset.
This is an interesting thread... good work folks. Again, I am going from my experiences over the decades and may not always be correct. My best advice is to do your math, talk to a lot of folks and make smart decisions on your wheel sizes.
Crispy, keep polishing. <g>
Good points you raise, thanks. Without looking at the charts and working from a defective memory <g>, I would usually go with tire manufacturers data. Don't forget what is meant by 'measured width', i.e a 10" wheel can actually be a measured 9.5". All of this can be really confusing, can't it?
Going back to the manufacturer's data, different construction methods ask for different sidewall angle specs and recommended wheel widtsh. A big heavy Kuhmo or Yok A032r can almost run flat on the sidewalls, while a Hoo-hoo is much more flexible. My Dunlop slicks are very weak inthe sidewall as are most slicks and need correct measured wheel widths to work perfectly.
As for the advice on different sizes to induce smooth breakaway, I prefer to do my suspension tuning by other means: Spring rates, air pressures, aero, shock rebound/compression and sway bars. These things are easily, relatively cheaply and quickly changed as opposed to wheel width and offset.
This is an interesting thread... good work folks. Again, I am going from my experiences over the decades and may not always be correct. My best advice is to do your math, talk to a lot of folks and make smart decisions on your wheel sizes.
Crispy, keep polishing. <g>
01-01-03, 09:53 PM
#54
Senior Member
Join Date: Dec 2001
Location: Los Gatos, CA
Posts: 270
Likes: 0
Received 0 Likes
on
0 Posts
fwiw.....the khumo v700's (285/30) are now on the 18X10 kinesis wheels. the sidewalls are dead vertical (by my eye anyways). no issues with rubbing with a quick romp around the block. (ride height about .75 inch lowered, jic coilovers, m2 links. spring rates are 12kg/mm front and 9kg/mm rear (about 670/500).
"street" performance seems impressive....turning is seemingly instantaneous
track testng scheduled for 1/25 at sears point. report to follow.
oh, and some pictures in the next couple of days......the gravy on it all is that the k28's look sweet!
fabian
"street" performance seems impressive....turning is seemingly instantaneous
track testng scheduled for 1/25 at sears point. report to follow.
oh, and some pictures in the next couple of days......the gravy on it all is that the k28's look sweet!
fabian
01-04-03, 09:17 PM
#58
Full Member
Join Date: Jan 2003
Location: Lurking
Posts: 208
Likes: 0
Received 0 Likes
on
0 Posts
that's light considering the size and contact patches
maxcoopers ccw 10 x 18 with 285/30-18 bfg r1a 45 lbs each
pretty close to each other
ssr comp 9.5 x 17 with 275/40-17 hoosier 36 lbs each
maxcoopers ccw 10 x 18 with 285/30-18 bfg r1a 45 lbs each
pretty close to each other
ssr comp 9.5 x 17 with 275/40-17 hoosier 36 lbs each
01-15-03, 12:15 AM
#59
Full Member
Join Date: Mar 2001
Location: Aliso Viejo, CA
Posts: 135
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by fluxen
This isn't the forum for it, but this discussion caught my attention. I have a set of Kinesis K10 wheels for my FD, 17x9.5" that I run 275/40's on all around. Anyone want to buy them? $1700 (compare to about $3k new)
I just bought a new race car and won't be tracking the FD much anymore.
This isn't the forum for it, but this discussion caught my attention. I have a set of Kinesis K10 wheels for my FD, 17x9.5" that I run 275/40's on all around. Anyone want to buy them? $1700 (compare to about $3k new)
I just bought a new race car and won't be tracking the FD much anymore.
http://www.speedventures.net/graphics/Kinesis1.JPG
http://www.speedventures.net/graphics/Kinesis2.JPG
http://www.speedventures.net/graphics/Kinesis3.JPG
http://www.speedventures.net/graphics/Kinesis4.JPG
http://www.speedventures.net/graphics/Kinesis5.JPG
and one on the car (but not so good):
01-15-03, 05:14 AM
#60
Lives on the Forum
fluxen, what offset? weight? hubcentric? how old are they? center caps included? lugnuts included? what size lugs? check your PMs. email me if you want to reply...
Last edited by SleepR1; 01-15-03 at 05:19 AM.
02-24-03, 04:01 PM
#64
Full Member
Join Date: Mar 2001
Location: Aliso Viejo, CA
Posts: 135
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by SleepR1
fluxen, what offset? weight? hubcentric? how old are they? center caps included? lugnuts included? what size lugs? check your PMs. email me if you want to reply...
fluxen, what offset? weight? hubcentric? how old are they? center caps included? lugnuts included? what size lugs? check your PMs. email me if you want to reply...
I'm parting out my single-turbo FD in this thread: https://www.rx7club.com/forum/showth...hreadid=160861
02-25-03, 04:40 AM
#66
Lives on the Forum
Originally posted by fluxen
Well, now that my car is totaled, I'm more incentivized to sell the Kinesis wheels (the Kinesis wheels weren't on the car for the accident, fortunately). I've put more info on the wheels in the following.
I'm parting out my single-turbo FD in this thread: https://www.rx7club.com/forum/showth...hreadid=160861
Well, now that my car is totaled, I'm more incentivized to sell the Kinesis wheels (the Kinesis wheels weren't on the car for the accident, fortunately). I've put more info on the wheels in the following.
I'm parting out my single-turbo FD in this thread: https://www.rx7club.com/forum/showth...hreadid=160861
Thread
Thread Starter
Forum
Replies
Last Post
rx8volks
Canadian Forum
0
08-13-15 04:55 AM
KAL797
Test Area 51
0
08-11-15 03:47 PM
