Following up on the mechanical side of the eMTB from my other post
Taking advantage of The MBS Matrix II Pro truck which is lighter than the previous matrix truck and have a prismatic hanger.
Old Matrix Pro Truckhttp://shop.mbs.com/accessories-486/mountainboard-trucks-suspension/mountainboard-trucks/mbs-matrix-ii-pro-truck-system.html
the old ones were a nightmare to attach a motor mount to them, luckily this New Trucks are more friendly. i designed a motor mount and have it machine in aluminium, i borrowed some ideas from the mount of @torqueboards and they are dimensioned to work with a 65T wheel pulley and a 15T motor pulley and a 85 T belt. this allow for the minimum distance from the pneumatic tire.
schematic of motor position to wheel:
this is the closest the motor shaft can safely be to the wheels and be able to install the motor pulley.
with the mount it’s a easier process to build a eMTB and give a much cleaner look to the board.
Under side and motor wires:
Now Just have to design a belt cover for preventing rocks to get in between the belt and pulley.