Only suitable for Disc brake. Dropout: 135mm(front wheel)/ 170mm or 190mm(rear wheel). Max speed, RPM & torqur as below. 36V 250W: 20-27km/h, 300 RPM, 20-30 N. 36V 350W: 20-30km/h, 320 RPM, 25-30 N. 36V 500W: 20-35km/h, 350 RPM, 30-35 N. 48V 500W: 35-45km/h, 450 RPM, 30-40N. 48V 1000W: 45-55km/h, 470 RPM, 30-40N. 48V 1500W: 50-60km/h, 540 RPM, 35-45N. 36V 250W/ 350W/ 500W KT Controller: rated current 10A, max current 20±1A, dimension 94x62x36mm. 48V 1000W KTController: rated current 15A, max current 30±1A, dimension 176x82x41mm. 48V 1500W KTController: rated current 22A, max current 45±1A, dimension 240x82x41mm. 1 PCS 36V 250W/ 350W/ 500W or 48V 1000W/ 1500w hub motor with rim and spokes. 2.1 PCS 36V or 48V controller with bag. KT LCD8, KT LCD3, KT LED880, No Display. 4.1 PCS Half twist throttle. 5.1 PAIR Power cut off brake lever. 1 PCS PAS Sensor. 20” & 24” rim: only black color. 26” rim 4 colors available: black red, green and yellow. If you need 26inch color rim, please specify when you place the order. Otherwise, we will send you the default black color.