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i can't help you w 17" or autocross, but will provide the following considerations that i've come across:
- wider is better, until you get to the point that your car can't turn the wheels any more.
- folks will try to 'balance' their car with different tire widths, but i struggle with the concept of removing traction from one end so as to balance with the other.
- look at the difference in diameter between the front and rear; over a, what, 3% or 5% difference and they say abs will start to act up.
- changes in rear tire diameter affect torque - think of them as your final final drive ratio.
- theoretical tire sizing suffers when you find out the tires you want are not available in the size you want.
- autocross tires are very different than track tires; i ran yoko ad08s that came up to temp quickly but wouldn't last 20 mins, vs nt01s which took a long time to come to temp but had ron jeremy lasting power.
- sway bars are a BIG deal, much more than shocks or springs.
- oversteer is faster than understeer, so chose front traction over rear if you have to; oversteer is also scarier than understeer.
that's all i got.
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