More reactive braking response, a novel parking mechanism, and the ability to lock the wheel with one hand only. This bike is so much fun! The fellows at Surron Motor were being Tremendous valuable with anything. I used to be so fired up when the bike lastly arrived. I'd suggest https://surronelectricbike26925.blog2freedom.com/36909934/the-smart-trick-of-sur-ron-ultra-bee-that-no-one-is-discussing