Noted:Battery not included. 1 front or rear Motor wheel(20/24/26/27.5/28/29inch 700C). 1 pair Power cut-off Brake lever. 1 set Twist Throttle. 1 Pedal Assistant Sensor. Conversion Kit not include tire. If you need a tire. 36V 250/350/500W about 20-35km/hour. 48V 500W about 40-50km/h. 48V 1000W about 45-55km/h. (different wheel size, road&weather condition and rider’s weight will have different speed). Brushless gear Hub Motor for 36V. Brushless Non-gear Hub Motor for 48V. Rim: Double-wall Aluminium Alloy Rim. Wheel Bottom bracket: Rear 135mm-142mm or Front 100mm. 25-35NM for 36v 250W 350W 500W. 30-40NM for 500W 1000W. 320 for 36V 250W 350w. 350 for 36V 500W. 470 for 48V 500W 1000W. 540 for 48V 1500W.