I have some pretty low end stuff on it right now. I'm not actually even sure what the model of the disc break on it is. it came on an older low end mongoose bike so i was looking to overhaul the entire braking system. I can fit a maximum of a 180mm rotor on the back. At the moment i'm much more concerned about rear stopping power as i am front stopping power. I know most of your stopping power is in the front, but i don't really want to go over my handle bars. my friends and i use an abandoned parking low on the weekends to do our own little race course setup, but we were getting complaints about noise levels from our bikes so we opted to use something a bit quieter. we're currently running 4 stroke motorized bycicles, but we need some more stopping power. had to make some of the corners much wider because they're like driving tanks around a corner. I wanted to overhaul my entire brake setup. I do have to use attachements to get the brake on the rear because i don't have tabs on my frame. with that said, would i be better off using Hydraulic ones?