These versatile black plastic wheels have silicone tires and measure 80 mm (3.15″) in diameter. What makes them special is the included set of interchangeable collets that can be inserted into the wheel to firmly grab four different shaft types: 3mm D, 3mm round, 4mm D, and 4mm round. The collet inserts start with a comfortably loose fit on their intended shafts, and unlike simple press-fit wheels, their grip on the shaft gets progressively tighter as they are compressed into the wheel disc, reducing the chances that the shaft will be able to slip within the wheel. This product is a pair of wheels.
These versatile wheels use interchangeable collets to tightly grab a variety of different common motor shafts, including the 3mm D-shafts on our micro metal gearmotors and mini plastic gearmotors and the 4mm D-shafts on our 20D metal gearmotors and 25D metal gearmotors. The wheels are 80 mm in diameter with 10 mm wide silicone tires, and they are available in black or white.
Four different collet inserts are included per wheel, allowing the wheel to work with four different shaft types: 3mm D, 3mm round, 4mm D, and 4mm round. The collet inserts slide easily onto their intended shafts and then clamp down as they are compressed into the wheel disc, resulting in a fit that is much tighter than can be achieved with similar press-fit wheels. The combined thickness of the collet and collet plate is approximately 6 mm, so we recommend you use this wheel with motors that have shafts that are at least 7.5 mm long. See the dimension diagram (384k pdf) for more information.
Pololu Multi-Hub Wheel collet inserts: 3mm round, 3mm D, 4mm round, and 4mm D.
Details for item #2463
This product is a pair of black 80×10mm wheels, and it consists of two sets of the following parts:
Using the wheel
Note that it is possible to assemble the wheels with a little wobble, but if that is a concern in your application, you can adjust how you tighten the three screws to get it as lined up as you like. Alternatively, you can often also fix a wobble just by pushing hard on the rim of the wheel at place where it’s most out of alignment.
The hole spacing on these wheels also works with our larger Universal Mounting Hubs (6 mm diameter and up), which can be used to adapt these wheels to motors with larger shafts, like our 37D metal gearmotor shown here:
If you get an M3 version of the universal mounting hub, you can use the 7 mm M3 screws that are included with the wheel to mount them together. However, please note that those screws will only go about 2 mm into the universal mounting hub, so you might consider getting longer screws (like 10 mm M3) for a more secure setup.
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