I used the kit to modify my single speed. The wheel size is 700c and has a relatively large gear ratio. I find the bike delivers good acceleration with the pedal assist. Once the bike is up to speed you can defiantly still feel the power giving you an additional boost. The throttle feature is quite useful also. Especially when starting from stationary. I would of liked slightly more power from the bottom of of the throttle but still pretty efficient. The battery pack charging light is quire small and easy to miss when it turns green. Especially when the instructions warn of leaving the battery on charge excessively. The battery pack is also mounted on the handle bars. which adds weight to the turning of the bike. I would of preferred to have the battery mounted in some other position on the frame.