Only suitable for Disc brake. Dropout: 100mm(front wheel)/ 135-142mm(rear wheel). Max speed, RPM & torqur as below. 48V 1000W: 45-55km/h, 470 RPM, 30-40N. 48V 1500W: 50-60km/h, 540 RPM, 35-45N. This kit comes with all the necessary parts you need- motor wheel, controller + bag, display, half twist throttle, brake lever, PAS, inner tube+tyre, disc brake, freewheel and winding pipe, except battery and charger. 48V 1000W 12 mosfet dual mode Controller: rated current 26A, dimension: about 149x82x42mm. 48V 1500W 15 mosfet dual mode Controller: rated current 35A, dimension: about 200x82x41mm. Rim ebike kit (with Kenda tire, disc brake and freewheel). 1 X 48V Motor wheel(with outer tire and inner tube). 1 X 48V controller. 1 X controller bag. 1 X SW900 display. 1 X twist throttle (pair). 1 X brake lever (pair). 1 X PAS sensor (8 magnets). 1 X disc brake. 1 X Battery and charger NOT included. Below is with 48V 1000W 1500W motor wheel with MTX rim. 20inch rim is without MTX rim, it’s alum alloy rim. 24-29inch & 700C wheel kit is only suitable for disc brake wheels. The tire for 20”/ 24”/ 26”/ 27.5” 28”/ 29”/ 700C wheel is Kenda brand. Below is SW900 controller specification for (36V 250/350/500W 48V 1000/1500W SW900 kit). Below is SW900 display. Below is the brake lever for SW900 display kit. Below full twist throttle is included for SW900 display kit. BZ-4(8)- 8 magnets PAS.