It depends on the vehicle and the look you're going for really, Joe. Way too many variables involved to provide any guidance other than make sure it goes with the look you're after. Never go smaller diameter in the rear is the only rule I would say.
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Trey
Current rides: 2000 BMW 540i/6 and 86 C10.
Former ride: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
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I always look at the different heights of the fender cut outs. On most cars and trucks the front wheel opening is taller in the front than in the rear. If you lower it and give it the ole muscle car rake, a 1" taller rear usually looks the best in my opinion but, it all depends on the vehicle. Some times you may need to go taller than 1" in the rear to fill the fender wells.
With all that said....to each their own. Everyone has their own ideas and views.