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Originally Posted by Joeyy
What are the 2 spline drivers? What size tires would the wheels except?
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Spline drives require a "key" adapter to turn 'em. He means he's got two of the key adapters he's tossing in, instead of just one.
17x7.5 will take up to a 235 width tire, however since you've got a little less fender space due to the wagon, 225 may be as large as you can go w/o doing a little fender rolling.
Sybir on the board here has a fender rolling tool that he rents out to those of us looking to fit some bigger tires. When done right, you'll be able to fit bigger tires and never even notice that the fender's been rolled.
Back to tire recomendations, I think Dean's list is pretty much right on. But for me, when talking about street tires for autocross, it's all about getting value, not all out grip. So I use the Hankook Ventus RS-2's in 235/40/17. They've got about a 9" wide contact patch, plus the rolling diameter is slightly undersized, which helps acceleration. And while they're not as sticky as the RT615's, they're like $60/tire cheaper! For $100/tire, you can't go wrong w/ the Hankooks, especially if you're just getting into autocross and the #1 thing that'll make you faster is seat time, not tires (tires are #2).
Now if you want to talk *track* tires, then I'll give you a hearty thumbs up to the RA-1's call. I'm pretty sure I'll be getting a set of those for next season's solo/track trials. Granted they're not an all out fast tire, they're much sticker than street tires once they heat up, and they'll last a long time. That's why they're the spec tire for lots of racing series.