Pololu’s 32x7mm press-fit plastic wheel is the same they use on their 3Pi robot, meaning it’s pretty effective! The wheel is designed to be press-fit onto a 3mm shaft motor, like the Solarbotics metal gear motors (GM11a / 12a / 13a / 14a / 18).

Note: Pololu motor shaft lengths are a bit longer than the Solarbotics series (9.2mm vs 8mm). To give the best snugness for the press-fit, you might consider shaving the inside of the wheel hub down 1mm (0.04″) so the shaft will reach the tightest part. Or install it from the other side!

Specifications

• Diameter: 1.26″ (32 mm)
• Width of tire: 0.26″ (6.5 mm)
• Weight: 0.12 oz (3.4 g)