I'm considering on using wheels that are 1" in diameter smaller for the following reasons:
So far, based on what I could find, it appears that 12.7mm change in radius would not affect alignment. (it would affect speedometer by 3.4%)
I read that number one concern would be scrub radius. Based on my (back of an envelope) calculations I should use rim with 3-4mm higher offset to keep the scrub radius the same (use wheels with 50-53mm offset). My calculation was based on assumption that struts are angled at about 25deg.
What I don't want is handling, alignment or tire wear problems. I see a lot of benefits in changing the wheel size and I'm curious if anyone has done (on earlier models perhaps) it and to what effect?