Space saving LEGO wheel

This is a redesign of the inner wheel to fit a LEGO Technic 43x22mm tyre. This model is designed to fit the motor inside the wheel instead of besides it, as shown in the photos (please excuse the shoddy soldering). The smaller footprint means the wheel is ideal for applications such as model RC cars or ant weight robots.

The wheel can hold a motor with a diameter of up to 24mm and a 2mm diameter shaft.