Hello all....quick rundown, I'm an Uber clyde.....I'm having issues with my brakes. I know this may be a mechanical question, but I figured since i'm a clyde, maybe I could get my answers here. I noticed the when I applied my brake, I heard scraping. Upon inspection of my rear wheel, I noticed that the wall of my wheel/rim had grooves or scratches all along the entire wheel.....I can't see the brake pad being extremely worn. My question is.....could it be due to my weight or is it another issue? This bike is an old Trek 800 mtn bike that I purchased on Craigslist. Your help would be greatly appreciated.