Originally Posted by DannoXYZ

Disc brakes under maximum-braking actually don't put any more stress on the spokes than your weight, 1G. Hitting bumps, pot-holes, jumping kerbs will actually stress the wheels much more than that, about 3-4 Gs. Even more important is the rate of building up those Gs and there's no way you can grab the brake and build up forces as quick as hitting a speed-bump in a parking lot.

Basically, nothing to worry about with disc brakes.