A custom wheel design concept, including a modified timing belt pulley and axle integrated into the wheel hub. This design accommodates a two-point shaft support for precision motion (minimal wobble).

Aluminum Wheels ($15.95 ea) 48cm OD with soft rubber tire. We can make these ourselves with a mill so they don't cost so much.

All kinds of wheels from Acroname. They have both flat traction and O-ring style tires in a variety of pretty colors.

Ball Casters ($11.99/pair) from the Robot Store.

Press Fit Ball Bearings

• BR-M03 ($6.00) 3mmID, 10mmOD x 4W

Needle Roller Bearings