Watts what size wheel and tire you run?

what about Holden

18x9.5 with a 250/640R18 up front

18x11 with a 280/640R18 in the rear

i'm running 230/650/18 yoks on a 8X18 front and 250/650/18 rear on 9X18's. I was thinking of running the 9 in the front and goto the 280 rear. from the earlier post you think the 230 is to big for the 8? I had some wierd push and tire wear issues. I'll ask woodman.

I don't know about the Yoks in that size. Woodman should know the recommended tire width for the tires.

You'll need to widen your rear fenders somehow if you want to stuff 280's back there. In order to get the ride height we wanted, Steve Bassen had to recut the fender opening on our fiberglass fenders and then the RRT guys semi-tubbed the upper wheel well.

ya I figured on that we already get rub on the inside well alittle bit. I get a bit of rub out of the front with fiberglass fenders. This aint no small mod. It got to be worth a tone of time on the track

Watts what size wheel and tire you run?

what about Holden

My brother and I run 18x9 all around w/ either 250 dunlops or 230yoks all around. Fitting the 280s in the rear shouldnt be too hard if you add some custom metal flares in the rear. Do a search for vjlax18. He did a similar setup in the rear to fit 275 hoosiers

Whoa, 8" for 230 is too small. You need 8.5" min for a yok, 9" is being a little more safe.

I would go with an 18x9.5 for 250, and 18x11 for 280 to make sure you are not deforming the tire.

If you can run 280 all around...widebody time :)

Just make sure you got the HP to push those big dawgs around.

It got to be worth a tone of time on the track

I doubt it's worth THAT much time unless you are already totally maxxing out your current setup. We ended up with the sizes we're running because they were readily available as scrubs when we changed the fenders and jumped to Mod class. The 280/650's were the front tires for ALMS/Grand-Am BMW and the 250/640's were the front tires for the Porsche GT3RS, if I remember correctly. It's hard to argue with $15 tires.

Be aware, whatever you pick up in cornering speed, you can also lose in straight-line speed due to drag and added weight.

FWIW, PTG ran approx. 280 front and 285 rear on these cars.

The most recent PTG rolex cars ran 305's all around :)

How much camber change will I need to make if I go to the Yok slicks? I'm running 4 to 4.5 with R-Comps.

Depends on alot of things. Around 4 should be good though. Take tire temps and determine if its right for the track/susp/tire setup you are running.

Key to being fast is finding out what is fast for your specific car. Someone else's car being fast does not mean the same setup on your car will be as fast (assuming equal drivers).

The most recent PTG rolex cars ran 305's all around :)

With the Hoosier "R-comps" slicks. Were those sized like street tires or did they use the metic slick sizing?

They seem to be sized normally, but they are pretty massive. Let me try to find the picture that shows how big they are.

Oh my mistake, it says 295 front/rear. I assume that means its a slick 295 size. Thats Beefy.
They are real slicks, just endurance compounds...hard!

I run 280/650/18 Front on an 18x10 wheel and 285/680/18 on an 18x12 wheel. FYI - I found out from SASCO that the 280/650/18 will be discontinued next year and replaced with 285/650/18. It will be .8 larger in both section width and tread width.

I have run as big as 305/690/18 on the rear, but it didn't help much as we are already struggling with getting enough heat in the tires.

Interesting point, I ran 250/640/18 Dunlop Scrubs last weekend at Willow Springs and got enough heat in those. I was getting consistent 200 degree temps accross the tire (give or take 10 degrees) on a 50 degree day. The rears were still 160 to 180 degrees, but that should come up to working range on a hotter day. We have had to change spring rates a bit (about 20 NM more in the front and 10 NM in the rear) to get the tire temps we want.

Oh, and if you can shove 280 tires under flared fenders on an E36, then DO IT!! You won't have the Aero Drag to contend with that I do. The widebody is nice, and provides a wider track, but does take more HP to move through the air. Can't wait for my new motor!!!!

My brother and I run 18x9 all around w/ either 250 dunlops or 230yoks all around. Fitting the 280s in the rear shouldnt be too hard if you add some custom metal flares in the rear. Do a search for vjlax18. He did a similar setup in the rear to fit 275 hoosiers
The Dunlop and Pirreli 280/285's are the same width as Hoosier and Kumho 285 R-Comps. We're doing another car right now to fit 280's all around on 18x10" wheels.