... can realize as high as 80% efficiency. e-Bike Conversion Kits:1 Long working life (>10,000 hours ... 50km/36V16AH battery pack· Speed: 0-45kpm· Suitable bike frame: 100mm front fork,or 135mm rear fork spacing· ... Double wall rim special for e-bike· Motor Specifications: 36Vdc/500W/320rpm or 48V/1000W/430rpm ... 18",20",24",26",700C,28"16",18",20",24",26",700C,28"16",18",20",24",26",700C,28" ...