15 inch wheels for 90 CRX

[madrabbit15]

We run 15 x7s with 205/50/15 hoosiers and kumhos. Works great, no problems what so ever. I personally don't see how any of the guys running 225s can do it. We have tried numerous ways and we either rub the rear trailing arm or the track is wider than the fender. Personally I think the 205s are faster than the 225s anyway. Takes too much hp for those wider tires on the faster straights.

[Xian]

We run 15 x7s with 205/50/15 hoosiers and kumhos. Works great, no problems what so ever. I personally don't see how any of the guys running 225s can do it. We have tried numerous ways and we either rub the rear trailing arm or the track is wider than the fender. Personally I think the 205s are faster than the 225s anyway. Takes too much hp for those wider tires on the faster straights.

I dunno... I'd say most ITA CRX's I've seen through the years ran 225/50 14's. I ran (IIRC) 14x7 38mm offset TD Pro Race 1.2's all the way around. There was a very small (2mm?) spacer used at the rears to keep them off the RTA too much. They'd still polish the RTA some but nothing worth worrying about. They'd clear the rolled rear fenders without any problems...

[adamjabaay]

my ita car runs 225 14'' on pnasports...38 offset I believe.

barely fits. But it fits great on decently rolled fenders all around. Same wheels all around


so yeah, what xian said

[Knestis]

To complicate the conversation, we ended up (through actual testing) running 225s on the front of Pablo the Golf and 205s on the rear. Hoosiers, all 14", and same height by different aspect ratio.

K

[ITA_honda]

Ive always run 205/50/15 with the Hoosier SM6 compound tires and the Enkei RPF1 wheels. Have had much success with them!

[Xian]

To complicate the conversation, we ended up (through actual testing) running 225s on the front of Pablo the Golf and 205s on the rear. Hoosiers, all 14", and same height by different aspect ratio.

K

Yup. And then you can complicate it even further by running the A compound at the rear...

[Chip42]

We've done some games with Steves MR2 showing ~2mph in a straight line at Roebling 205 R6 vs 225 R6. 225's were on 14" wheels, 205s were on stoopid light SSR 15", so not sure all of that is the tire. overall lap times were similar, but the speed was made differently. we also tried some mixed wide rear/narrow fronts but it unbalances the car toward understeer. was slightly faster in a straight line though.

explain the A comp on the rear thing... more grip on the rear = good why? or is there a weight issue or something else I'm missing?

[Xian]

explain the A comp on the rear thing... more grip on the rear = good why? or is there a weight issue or something else I'm missing?

Nah, it's not really a "more grip" thing more a matter of how quickly the rear end comes up to "normal" grip levels. On R's, a "fast" CRX is a handful for the first couple laps as the fronts gain heat/grip more quickly than the rears. Put R's up front and A's in back and they should come up to temp/grip more or less equally which lets you gain time in the first couple laps. Total grip potential at operating temp is (effectively) the same for the rest of the race and the rears never get so overloaded that they can go off or get greasy.

Disclaimer: this ^^^ is second hand info from folks who've gone down the road of staggered compounds. As much as I liked the theory of it, I preferred the ability to easily rotate tires front/back and even out wear and heat cycles.