N20 D-Shaft Rear Wheel
Driven rear wheel (print two) for the 'SG90 Ackermann Steering Rover Chassis' kit. It is Ø60 x 20 mm with the same tyre grooves as the front wheel: 3 x 1.5 mm, 5 mm in from each face. The Ø16 hub has a 3.2 mm bore for the N20's 3 mm D-shaft, locked by a radial M3 heat-set insert (Ø4.0 bore) and an M3x5 grub screw that bears on the shaft flat. The spoke pattern leaves a gap over the insert, and a Ø5 hole through the rim lets a soldering iron and a 1.5 mm hex key reach it.
robotics kit n20 wheel