Pololu Wheel 42×19mm Pair
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These white plastic wheels have rubber tires measuring 42 mm (1.65″) in diameter and press-fit onto the 3mm D output shafts on many of our motors, including our micro metal gearmotors and our mini plastic gearmotors with 3mm D-shafts. Teeth on the hub optionally allow a reflectance sensor to be used for encoder feedback. These wheels are sold in pairs.
Overview
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These rugged wheels are designed to press-fit securely onto the 3mm D output shafts of our micro metal gearmotors. These gearmotors should be mounted onto the side of the hub with the protruding teeth, as shown on the right. The output shaft will slide into the socket easily at first but will achieve a snug fit when pressed through to the other edge of the hub.
These wheels will also work with our mini plastic gearmotors with 3mm D-shaft outputs if the gearmotor is mounted to the other side of the wheel.
Our extended micro metal gearmotor bracket is specifically designed to work with this wheel. Please note that the non-extended version of our mounting bracket (product #989) will not work well with this wheel.
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Micro metal gearmotor with Pololu wheel 42×19mm and extended bracket. |
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Specifications
- Diameter: 42 mm (1.65″)
- Width of tire: 19 mm (0.75″)
- Weight: 19 g (0.66 oz)
- Shaft type: 3mm “D”
Encoder Feedback
The hub has twelve teeth, each 3 mm wide and separated from its neighbors by 3 mm gaps, and you can use a reflectance sensor like our QTR-1A to track the wheel rotation using these teeth. We used to offer a quadrature encoder that used these teeth to provide up to 48 counts per revolution, but we have since discontinued that product and now recommend just using one of our much better magnetic encoder pair kits for micro metal gearmotors.