Looking for advice on 160 vs 180 rotor for front wheel. I am 150 lbs riding a light full suspension bike with Stans No Tubes Crest 29er wheels (a pretty light wheelset) and XTR brakes. Here in Utah we have lots of steep downhills. 160s have always been fine on 26 inch wheels for me, but I'm wondering if I should go up a size. I need new rotors anyway.