17/18 has a lot of benefits.
Business in the front, baller in the back.
17" wheels give more clearance from lock to lock with less work on pulling the fenders running a crazier stretch etc.
A smaller diameter wheel means a lighter load on all of your steering components when driving the car hard.
I've read that a lot of guys have issues breaking suspension components in the front when running 18s with a large width.
17" tires are cheaper than 18" tires so you save money on tires.
18s in the back are mostly for looks, and better tire sizing too. 18s come in 225/40/18 in all sorts of different brands. 225/40/17 tires usually A: Suck or B: Expensive C: Both.
There's more reasons I can think of, but those were my reasons when I decided I wanted 17/18 stagger.
Quote:
Originally Posted by wakdady
i would imagine you get more understeer with that setup. even running same diameter but staggered widths could create extra understeer, although more astheticaly pleasing.
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Why would that create understeer? He didn't even specify widths.