... , 250W, 350W,500W brushless motor 20", 26", 28" wheel 36V/12Ah, 36V/14Ah, 48V/12Ah, 48V/14Ah Electric Bike Conversion KitKit for converting normal ... Rims available: 20”, 26", 28" (optional) Lead-acid battery: 36V/12Ah, 36V/14Ah, 48V/12Ah, 48V/14Ah (optional) Max Speed: 25km/h(EU standard ...