Sebring27

Hi
Is it ok to run this combo square all round?
I know that hoosier recommend 11" but have also heard many run this combo?
Your experience would be appreciated
Many thanks!

taken19

It will work fine. Many have done it for years.

The only thing you may come across is the front wheels rubbing brake cooling ducts on sharp corners (one complete turn of the steering wheel or so), mostly in the paddock.

Olitho

I used to use those all the time with 305 or 315 tires. It works great.

StreetSpeed

That's good to hear. I have a set of these rims with worn out R888s I'm trying to figure out what to do with. Will probably do 285/305 Conti scrubs but I didn't think 305 would fit on this rim. Thanks!

CHJ In Virginia

I am going to offer a contrary opinion. Running the 315's I could not get full tread contact even with low tire pressures. There was always about 1/4 - 1/2" of tread on each side of the tire that did not make full contact. The narrow rim dimension compared to recommended caused the tire to bow. Running the 305's and adjusting pressure appropriately, I could get full contact all the way across the tread. With the 315's I had contact with my brake cooling ducts - the 305's no problem.

Sebring27

Thanks appreciated!

Sebring27

Thanks Oli!

Sebring27

Thanks!

Olitho

A wider rim is more appropriate, especially for the 315s, but they still work great. I would rather run a Hoosier 315 for fast lap times than anything else in a 305 or 295.

Sebring27

Thanks again Oli - i am now very clear !

69autoXr

I thought I remember being told the 315 Hoosier was the same tire as the 305, just re-labeled.

Pumba

A 315 section tire is build for a 11.5 inch wide rim. A minimum rim width would be 11.0 inches.

Olitho

That is all nice in the spec book, but a 315 on a 10.5 in rim is still faster than a smaller tire on the rim. These things were figured out during an era where rim widths were limited, but the 315 tire was still allowed. While 10.5" might not be ideal, you will still get better results than running the narrower tire.

autoxer6

I run 335 on a 10.5" for autocross. Many national autocross drivers do. Definitely more forward bite and a larger contact patch. Tough to mount.

mountainbiker2

Same here.

parsonsj

I ran BFG Rival 315s on a 10.5 front wheel last month at Daytona. An 11" wheel would have worked better, but they were fine.

savage

i would never believe it, at ponoco racetrack two weeks ago, two guys showed up with 315/30/18's on 9.5 wheels(fronts) crushed everyone!! 2010 GS, 2009 z06, the z06 was running forgeline? wheels and when i asked why did he have these made 9.5 instead of 10.5 or 11, he said he has run 315's on 9.5 for years( i have been autocrossing/ tracking sence 1990 and he was the best i ever seen) he might know what he is talking about, the gs had factory 9.5 wheels with his 315's. these guys were nice enough to give me some alignment numbers( and some help from froggy ) got me a F.T.D. today at a NCCC event, thanks froggy, thanks guys that dont read spec books!