Use the Gears to Count Movement with Sensors! Evenly spaced holes near the edge which can be used with a slotted optocoupler to measure velocity acceleration or distance of the gear or vehicle. Holes can also be used to attach the gear to a wheel pulley or other objects.

• Gear 1 : 9/16 inches (14.30 mm) in diameter with 13 teeth
• Gear 2 : 3/4 inches (19.05 mm) in diameter with 18 teeth
• Gear 3 : 1 9/16 (39.69 mm) inches in diameter with 38 teeth
• Gear 4 : 2 11/32 (59.53 mm) inches in diameter with 58 teeth
• 4 center hole inserts to 1/8 inches (3.18 mm)
• 2 center hole inserts to 2 mm

Total: 10 Pieces