I had full discs on my full suspension MTB prior to motorization - I upped the front to a 203mm and kept the rear at 160mm. They are mechanical, BB7's with semi-metallic pads and SRAM full-metal-jacket cables. They bite hard at any speed, the cables give great feel and were simple to upgrade from stock.... just changed pads, front rotor and cables. Having ridden motorcycles for years, I know for myself, that I wouldn't be comfortable with anything less.... just my 2 cents