Pine car derby wheels

Made some pine car derby wheels for my kids. There are two designs: one that can accommodate a nail as an axle, the second you can add a bearing and a screw as an axle to make things a little faster.

Bearing details: 5mmx11mmx4mm

Wheel width is 3mm versus the bearing being 4mm wide. There is a little space between the wheel and the derby car. Cant have the wheel touch the car can we!! :)

Bearings are similar to the ones used in RC cars like traxxas, axial, redcat and many others. Very