Additional reactive braking response, a novel parking mechanism, and the ability to lock the wheel with one hand only. This bike is much pleasurable! The fellows at Surron Motor were being Tremendous practical with everything. I was so excited when the bike lastly came. I would recommend them to anyone! https://zandermljjg.eedblog.com/36937890/the-smart-trick-of-surron-electric-bike-that-no-one-is-discussing