It uses a regular RC car motor, and for my version I used a 4wd belt from a scalextric Ford Focus, but since the tension is adjustble, you should be able to find something that fits.
An additional (and not yet fully developed) feature is the tire break-in attatchment, where you can mount an additional axle underneath the rotating axle, to break in tires. This attatchment requires an additional M6 screw and nyloc nut.
Required hardware:
1x 3/32 axle
2x 3/32 flanged bearings
4x M2 set screws
3x M6 screws
2x M6 nuts
1x M6 nyloc nut
2x motor mounting screws.
The author marked this model as their own original creation.