Additional reactive braking response, a singular parking mechanism, and the opportunity to lock the wheel with 1 hand only. This bike is a lot entertaining! The guys at Surron Motor had been super helpful with every little thing. I was so thrilled when the bike last but not least came. https://devinbcihf.theideasblog.com/37489741/surron-electric-bike-things-to-know-before-you-buy