450 W Electric Bicycle Left Drive Conversion Installation kit can fit Most of The Usual Bicycle use Spoke Chain Wheel Chain Drive for City Bicycles. This kit is for the bike that using the V brake on the rear wheel. If your bike uses disc brake or coaster brake, this kit does not compatible with that bike, please choose other kits. If you can not sure your bike type, please send me your bike picture, so I can recommend you the correct kit. The motor bracket maybe does not fit your bike frame, this you need to modify the bracket by yourself, please confirm this. If you do not know how to modify, please send me your bike picture, so I can give you suggestion. The difference between 24V and 36V is the working current, if you want to ride longer, I recommend 36V kit. 5This controller comes with 1 fuse wire and 3 fuses, if you burn 1 fuse, you’d better note what makes it burnt and avoid this happen again, or please feel free to contact me for help. This item has 2 throttle types for choice, if you want the twist type, please choose the “key throttle” option, and if you want the thumb type, please choose the “thumb throttle” option, thank you. Please note, this item doesn’t fit the bicycle that use the coaster brake. This item is for the bike that uses the hub diameter less than 36mm. Important: This item doesn’t include battery or charger. Please see above video before you order this item: https:// This is our newest kit for electric common bike, this kit mounts the sprocket on the wheel spokes, so it fits most of bicycle wheel. Motor use freewheel so when wheel rotating, the motor will not rotate, just like a normal bike, this can reduce resistance. The twist kit includes: 1. 1x 450W brush motor with freewheel 2. 1x Customized sprocket & components 4. 1x Motor controller 5. 1x Mounting plate + bolts 6. 1x Twist throttle (with battery indicator & key switch) The thumb kit includes: 1. 1x Wuxing thumb throttle (with battery indicator & switch button) Motor with freewheel: (with this freewheel, when you step pedal without motor power, the motor will not rotate, so reduce drag).