FD Rear 315/30r18's!!!
 

Most people probably wonder how wide of a tire can the stock rear fender hold. Well, with the right offsett and just a fender roll I was able to tuck 315's at the rear. Nice, clean, and easy.......pics and specs up soon.

Its pricey to buy wide tires and not have em fit without excessive mods, so hope this information helps out!:nod:

CCW wheels
specs are 10.5"width/7.5" backspacing (+44mm)
Tires Azenis Rt-615
315/30r18

Rear View:
Attachment 718575

Top View:
Attachment 718576

Nice!
 

Your trailing arms are stock? If stock, there must not be much space between them and your tires...

Nice fitment!

I have some CCW 18x11 7.5" backspacing and am in need of new tires anyway.

More info please.

I have 18x11 +41 fikse wheels with 295/30 and there is tons more room. My tires tuck all the way under

19x11 Work Meister with 315/25/19 T1R's. Stock trailing arms. Inner fender lip removed with no fender full.

Aftermarket trailing arms and there's about 1/4" or so before touching. Suprisingly these FD's can really pack some tires at the rear without major mods.

I believe that having an extra .5" of rim width with a 7.5" backspacing may throw the fitment off either to the outside or inside depending on the rim build. I'm no expert, but the specs off my LM's worked though.

Right, offset is the key to centering the tire between the fender and unibody.

the 7.5" backspace on 11" wide rim gives you a 38 offset which means you will foul the fender lip 6mm more than the 7.5" backspace on the 10.5" rim (44 offset) with the same size tire.

You would be limited to 305 on the 11" +38 rim in order to have to do the same amount of work the op did to fit his 315 on his 10.5" +44.

I just went to 18x10.5 +38 all around (because it is hard to find higher offset wider monoblocks) and am limited to 265/35-18 on the rear with stock fenders and 1.3 deg neg camber as it just barely rubs the lettering on the sidewall on compression.

With my +38 offset and 1.3 deg neg camber rolling the 18mm rear fender lip completely under or cutting it off would fit a 295 and anything beyond that will require some pull on the fender as well and or more negative camber.

My volks are 18x10 +44 i have 275s i feel better i can go with the 315s. but now that i have the pettit rear flares i need a wider wheel or space it up with an additional 2 inches

Glad this thread was useful...

nice meaty tires!

Good info. What size wheel/tire you running in front?

Jack

It's great to see someone stuff some wide tires under an FD. I have a few questions:

1. Any rubbing under cornering?
2. Any rubbing under bumps?
3. Spring rates?
4. Sways?
5. Inner clearance?
6. Ride height?

Thanks,

Andrew

275/35r18 in the front. Slight rubbing at the front lower control arm (rub area was shaved with a dremel)

Suspension are Pettit Trackpro stage III front spring 12kg/rear10kg

There's about 1" of clearance between fender and tire. Inside clearance between trailing arm is 1/4". This seems more fuctional when driving on the streets. Sways bars are just regular Racing Beats...No rubbing when going over speed bumps or going in and out of drive ways.:nod:

Haven't measured the height yet....

Nice. How much camber are you running? Also, would a 295/40 look stretched on a 10.5 ?

Good info more please

There were no camber plates install as you can see from the pics. Its pretty dead on straight and flush.

295's will not be stretched on a 10.5" width wheel. My previous tires were 285's and it was square. The 315's are pretty squared as well.

The only way to find out....is to simply try:nod:

The RT-615's in that size is about 15mm narrower than marked. Yes, they are known for running a bit small in tread width compared to similarly matched tires. So in other words, they're actually not 315. Not to rain on your party, but just enlightening.

I have 295 AD08s on my 11" wheel and it isnt stretched at all

That fitment looks perfect!

Any useful information are always welcome.:nod: And yes, every tire manufacture does have their own variation in tire sizing.

Good info. very nice to see people stuffing as much meet in there as they can. Dan Chadwick, Erik strelnik, and Kevin doe also have all been running 315's in the rear of the fd with only fender rolling for a few years without issue.

great fitment

do you have any more pictures of the setup? from different angles and distance?

So this fitment is good with +44. Whts the max on the front without any rubbing issue?

I'll get some pics loaded tomorrow......max front that I'm running is 275's with rolled fenders and slightly shaved lower control arms. The plastic inner lining will rub a little at max turns....no biggie:nod:

thats a pretty nice fitment with not that much poke

CCW are well crafted

Looks great.

Hmm!

I wonder if my 295/35/19's on 19X10.5's 38-offset will fit then..

Its worth a shot, it may just stick out a bit only.....got some crappy pics the other day. I'll take some more before posting.

Attachment 718580
Attachment 718581


Here the fronts are still sunken inwards about 1/2" or so.....the wheel build should of have been done with a 10.5" instead of a 10.0".
Attachment 718582

I wonder if my 295/35/19's on 19X10.5's 38-offset will fit then..

as I found +38 offset fits 265 with front camber and lip rolled under and rear 265 with 1.6 deg camber stock fender barely fits (rubs letters on sidewall).

Gonna need more massaging of body to fit anything bigger than 265 on +38.

Based on abc's info that the Falken 615's will work, I doubt the Pilot PS2's will. The Falken's and Kuhmo's have a tread width of 11.7 & 11.5 respectively. The PS2 has a tread width of 12.5. All of these are with the 315/30-18 size.

The Kuhmo's are the cheapest by about $100 at this size. I use them on my 17x8 wheels with a 255/40-17 and have no complaints except that they are about 6lbs heavier than the PS2's.

I'll be giving the XS's a try on my CCW SP500 18x10's in the back next time. CCW told me that the 10" SP500's are actually closer to a 10.5 so I shouldn't have any issues. The 285/30-18 Sumitomo's on there now actually look a tad stretched. Perfect for the front but too small for the back.

tirerack has a "section width" and a "tread width"
which of these determines the full width of the tire after being mounted to the rim?
i thought section width was the one, and the one we should look at for measuring whether wheel/tire setup will fit or not?
if so, falken tires website does not list the section width for the 615k's and their "tread width" listed (11.7") would only equate to 297mm wide

ABC, perhaps you can manually measure the widest part of the 315 wheel/tire and get back to us on exactly how wide it is?

oh crap, edit: falken tires does list the section width, which is 12.6

I think the section width is the widest part of the tire including the sidewall. This would change based on the rim used(but never less than tread width). The tread-width is the part that contacts the ground and wouldn't vary much at all. I pulled the widths off of Falken's site as they weren't all listed on tirerack.

Assuming full travel of the suspension the section width would be important to determine if a tire will rub on the fender. A rounded tire, however, may fit better due to the movement of the suspension and it increasing negative camber when compressed.

It seems the Michelin's get you more contact with the ground for a given overall width.

I also concur that the RT615's ran narrower than the next tire I used (AD07's)

Haven't been checking on this thread lately. Let me confirm your findings to see if the width is 12.6. I'll measure it and post it up for future reference to the rest of the members that may be interested. :nod:

The PS2 tires are very nice, but cost too much for my purpose. BFG Drags/NT01 will be my next setup when the Falkens are used up.

Looks sweet

this is a very inspiring thread indeed.

niceeee

Great looking wheel/tire