Wheel Spacers 101

AviatorTim

Thanks. That was a very helpful video. He mentions one reason you would want to add spacers is to accomdate larger brake calipers. I noticed the three front rims Nissan offers come with 43, 47 and 40 offsets. I assume that's to accomdate the larger calipers on the front brakes. Does anyone no exactly how much offset is needed to accomodate the 370Z front brakes (non-sport edition)?

Also what if a wheel has more offset than the factory wheel? For example, if I replace the rear factory 18x9 +15 with a 18x9.5 +35. I believe that will increase the scrub radius. What effect is that going to have on tire wear, performance, etc?