for the rear, both will give you sufficient traction, buuuttttt
a) you will be faster with the 17s
b)you will have more tire selection with 17s
c)tires will be cheaper with 17s
d)you will have the luxury of having "track dedicated" wheels/tires.
e)skinnies are not NEEDED to run 17's, or 15s in the back. but they help and get you some easy ET
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