You want an outrunner brushless motor (they have a tremendous amount of power) once again the best place to start looking is hobbyking.com
The number one thing when looking for an outrunner brushless motor is large size motor with the lowest kv motor possible. To get Revolutions per minute you multiple the kv by the volts to the motor. You want a kv below 300kv but preferably below 200kv. Why? Your looking for torque/power not high speed. you can always gear it higher to get more speed but you can make a high kv motor perform better at low speeds. When you think about it you way much more than the average RC car.
Here are some that will work.
How do you calculate the speed of your eboard: https://howtomakeanelectricskateboard.wordpress.com/2013/05/09/calculating-speed/
Don’t go aiming for a low top speed cause you’re going to spend most of your time going from 0 -15kph.
**Buy the lowest kv motor you can afford**
The Pulleys & Belts
For belts and pulleys I’ve found this to be the best website to purchase online if a little slow in delivery. https://sdp-si.com/eStore/Catalog
Belts: For belts most people choose a HTD 5mm teeth belts either 9mm or 12 mm wide. This type of belt are designed to withstand some load.
Small pulley: The motors above have a 8mm bore. So figure out how many teeth you will need use the speed calculator above but 15 teeth should be good. e.g:
- Part Number: A 6Z25M015DF0908
- 5 mm (HTD) Pitch,15 Teeth, 8mm Bore, Aluminum Insert, Polycarbonate Timing Pulley for 9mm Wide Belt
Large pulley: This needs to attach to the wheels. You can pick yourself a pre-made piece from Alien power systems or you can purchase a large pulley and fix it to the wheel. To do this I used large bolts that threaded throught the cogs of the Abec 11 wheels. Once again use the speed calcualtor above to figure out whats best. Aim for a low speed. Honestly….I cant stress buying a low kv motor and aiming for a lowish top speed enough.
or your can buy a plastic one here: http://i.materialise.com/gallery/247a7827-e1ab-484e-97aa-a6f7fb197a5e