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YOUR RESEARCHTire suggestions
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Check tire rack specs
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Suggestion
Check the Tire Rack specs for the particular tires you end up choosing.
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Suggestion · Original poster
Want to run 245x40 up front and 275-295 in the rear
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Suggestion
(And they also like to pick up every piece of gravel and road debris and sling it at your paint at high speed, which you probably don't want, either.) If it's just DEs, then it's not competitive anyhow, and you might as well run your street tires for track, and get dedicated tires just for autocross.
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Suggestion
If you want to be competitive in autocross in most clubs, you'll need Hoosier A6, but they wear out very fast; Kumho V710 are slightly slower, but last 3x as long (FWIW I run V710 for autox).
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Suggestion
(And they also like to pick up every piece of gravel and road debris and sling it at your paint at high speed, which you probably don't want, either.) If it's just DEs, then it's not competitive anyhow, and you might as well run your street tires for track, and get dedicated tires just for autocross.
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Suggestion
If you want to be competitive in autocross in most clubs, you'll need Hoosier A6, but they wear out very fast; Kumho V710 are slightly slower, but last 3x as long (FWIW I run V710 for autox).
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Need a tire with a non-DOT R rating.
Preferably 200wr
These will be primarily for Street/AX/DE (ocassional)
Running 18" Turbo 1 hollow spokes in 7.5" and 10" sizes
Want to run 245x40 up front and 275-295 in the rear
Live in NorCal and not too worried about wet traction since I have a stock set of 7&9x17s with Michelins for winter tires to use if I need to.
Thanks
Most manufacturers 245 x 40 tires are too wide for a 7.5" wide wheel. 225 x 40 is about the widest tire you can "safely" install on 7.5 " wheels. Check the Tire Rack specs for the particular tires you end up choosing.
SCCA or PCA autocross? Or an indie local club? If you want to be competitive in autocross in most clubs, you'll need Hoosier A6, but they wear out very fast; Kumho V710 are slightly slower, but last 3x as long (FWIW I run V710 for autox). R6, R888 and other harder r-comp track tires people like for time trials and DE need a lot of heat for optimal grip, and are hard to get up to temp for autocross. NONE of these are safe on the road if there's any water at all, as they hydroplane like mad, so driving to the track/autocross is a crapshoot if any chance of rain is forecast. (And they also like to pick up every piece of gravel and road debris and sling it at your paint at high speed, which you probably don't want, either.) If it's just DEs, then it's not competitive anyhow, and you might as well run your street tires for track, and get dedicated tires just for autocross.
In short: if you want just one set of tires, you're going to have to compromise with a sticky street tire. Hankook RS3 would probably work very well for you. 225/40R-18 in the front and 285/35R-18 would be about the largest you could fit on those wheels. If you get dedicated track/autocross wheels, you'd have more flexibility, but doublecheck what's legal for your class before spending any money lest you inadvertently bump yourself into an uncompetitive class.
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