This is one of the only DIY electric bike kits that uses a centerdrive. It keeps weight low and center on the bike frame and leverages your rear cassette to improve climbing or speed but may wear your chain and cogs more quickly as a result. This kit offers pedal assist and throttle mode and comes with the motor, front ring, cranks, brake levers and display but you’ll need to buy a battery pack separately. This is also referred to as the Bafang BBS02 kit with 750 watt middrive.