i know everyone says it's not a great idea, but i never noticed any saying anything outside of cosmetic/squeaking problems. so, i tried it. but my brakes are sticking very badly. i was riding down a hill and it jammed so bad that i flew off the bike and had to put a good amount of effort into unsticking it. does anyone know if the problem stems from the rims not being machined, my brakes or my brake pads? and how to fix it? i'm running tektro 521AG brakes on velocity chukkers. i've tried cleaning both the rim and the brakes with rubbing alcohol and taking some sandpaper lightly to the rims, though the problem is still there.