GT3 Nut

Unfortunately the "cup" slicks do not come in the right size for the rear for the street car. The 27/68 size is too tall and messes up the ABS bigtime.
Thanks for the heads up on the 7A/8A though.

Biker

Will Dunlop M 285-680-R18 on the rear and MS 250-640-R18 fit and work on the street GT3? According to these posts, they won't. But, I have "won" a set of these Dunlop tires. These are Cup Car tires and I am worried that the fronts won't fit and the ABS will not work properly. I have the stock wheels and chamber on this car.

Bob Rouleau

Stock camber and slicks are incompatible. Slicks require lots of negativer camber to deliver their additional performance. Unless you go to around 4 degrees negative you're wasting your money. Stock camber is not even enough for the DOT R compound tires to work correctly. The Michelin Cup wants around 2.5 negative. Stock is around neg 0.5 to neg 1 degree.

Best,

Biker

Bob, thanks, I can do the camber, I know what you are talking about. But; will these tires work then?

Larry Herman

Not with your street ABS. Just ask Matt E. (GT3 Nut) about his experiences.

Geoffrey

Of course, you can always install the ABS rings with less teeth on the front end and run the larger 680s in the rear.

Larry Herman

Yeah, but the rings are part of (or pressed onto) the stub axle, and so you have to remove the nut and stub axle to do so. Not a huge job, but probably not worth it to just try the slicks. If you were going to run them permanently though.....

GT3 Nut

Where do I get the ABS rings with less teeth? PMNA? Are they compatible with street ABS system? How big of a job is this?