I have a triple and change a lot, going down hill I use the third ring and ride FAST, I complained about being dropped a lot and was told to ride in the third ring more, I did and my knees said I don't think so, they ached so bad, so now I only use it for downhills, I did get faster and wasn't dropped as bad and my thighs seem to have grown but I can't and don't have to deal with the knee pain, I am not racing this is supposed to be fun!

I read a post about butt's getting bigger a while back, I didn't have any problem until I started mashing in a harder gear, now mine definately has gotten bigger, but it was flat to begin with so I don't mind just gotta figure out how to keep it this way.