Originally Posted by Expatriate
Your wheels flex when a sideways load is applied to them. Might not be a problem with a custom 36h wheelset with evenly tensioned spokes, but if you're running 32 spokes, and weigh a bit, your wheel will flex enough for the rotor to rub. No big deal.
The rotor's bolted to the hub. Spoke count or tension doesn't have anything to do with it.