Hi all,

What do roadracers use for their ITR's for wheel and tire sizing? I'm trying to decide between 15x7 or 16x7 and I assume 225/50 all around.

 

That'll depend on the class I assume. Do you mean for road racing or driving schools?

I'd run 15x7. Cheaper wheels, cheaper tires. R compounds and full slciks have very hard sidewalls so the advantage of small sidewalls with street tires isn't as big and I'd rather have the wheel mass closer to the hub.

 

I'm running 15X7 205/50 15" Falken Azenis. The wheels are Stern Auguzze's which are discontinued...

You'll find dave is correct about 16" being VERY expensive in comparison.

I'd even run 15x6.5 or 15x6 before I'd spend the extra dough for 16"...that is unless you're VERY serious about getting some traction w/light weight wheels & have lots o'dough :shock:

 

Thanks for the posts guys. I'll be running some time trial events. I saw on Kosei Japan's website their K-1's are doublespoke... look much nicer than the single spoke ones at Tirerack... anyone know where you can get those?

 

Those are the new design K1's that have not yet hit the states.

I have to agree 15x7 would be my choice.

 

Yeah, I emailed tirerack, they said they'll be here in a couple of months to replace the old K1's.

 

225/50/15's are too tall. 225/45/15 (Hoosiers) are the only tire I'm aware of in a 225 that will fit on an R. Even then you'll have to roll the rear fenders. That said, a good 205 (street or competition) tire will be more than enough for an R especially with 7-8 wide wheels.

SSR Compeitions are good choice for the R. Look good and are 7.5 inches wide and are about 10lbs. They are more expensive that other options, but are lighter and wider than most 15 inch wheels

 

Oh damn, thought 225/50/15 would fit. 205's are enough for traction?

It's funny, you guys make 16s sound so expensive... my daily driver is a Supra, try 18s. Last year we ran my friend's supra in a trial, 315s in the rear... one tire cost me enough to buy an entire set of 15s.

 

Does enkei make the the RPF1 in 15x7 5x114.3?

 

I run UKDM Type R rims which are the same size as US stock, 15x6JJ, but lighter at 12 lbs. each; I wrap them with Falken Azenis 205/50/15 tires. I'd like 15x7 rims better but at $400 for a set of the Euro R rims, I couldn't pass 'em up