SKU: 76108446997

Pololu Multi-Hub Wheel w/Inserts for 3mm and 4mm Shafts - 80x10mm, Black, 2-Pack Pololu 3690

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Description

Pololu Multi-Hub Wheel w/Inserts for 3mm and 4mm Shafts - 80x10mm, Black, 2-Pack Pololu 3690These 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

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.


Overview

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.

Black 80×10mm Pololu Multi-Hub Wheel installed on a 4mm D-shaft.

White 80×10mm Pololu Multi-Hub Wheel installed on a 3mm D-shaft.

80×10mm Pololu Multi-Hub Wheel installed on the 4mm D-shaft of a 20D metal gearmotor.

80×10mm Pololu Multi-Hub Wheel installed on the 3mm D-shaft of a micro metal gearmotor.

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 #3690

This product is a pair of black 80×10mm wheels, and it consists of two sets of the following parts:

 

Pololu Multi-Hub Wheel w/Inserts for 3mm and 4mm Shafts – 80×10mm, Black, 2-pack.

  • silicone tire
  • black ABS wheel disc
  • four black ABS collet inserts:
    • collet for 3mm D-shafts
    • collet for 3mm round shafts
    • collet for 4mm D-shafts
    • collet for 4mm round shafts
  • threaded metal collet plate
  • three 7mm-long M3 screws

Using the wheel

 

 

Installing the Pololu Multi-Hub Wheel on a motor shaft.

  1. Insert the motor shaft through the hole in the middle of the collet plate, making sure that the protrusions around the three threaded holes are facing out, away from the motor. Warning: these protrusions can be sharp!
  2. Slide the appropriate collet onto the motor shaft, making sure that the embossed digit (i.e. the “3” or “4”) is facing out, away from the motor.
  3. Slide the wheel on to the motor shaft with the embossed Pololu logo facing out, away from the motor, and press it onto the collet firmly, which will cause the collet to start squeezing down on the shaft. If you have the collet or wheel backward, the collet will not fit into the hole in the wheel.
  4. Insert three M3 screws through every other hole in the wheel and start screwing them into the threaded holes in the collet plate. Tighten each screw a little at a time so the wheel is pulled onto the collet evenly. For typical shafts, you will be able to tighten until the collet plate is almost flush with the back of the wheel, and the front of the collet is almost flush with the front of the wheel. If your shaft is a little larger than nominal, the collet might not press as far into the wheel, and if your shaft is a little smaller than nominal, you can insert something like a small washer between the collet plate and the collet to let it push the collet even farther into the wheel (i.e. past flush). Be careful not to over-tighten the screws as this can strip the threading on the collet plate.

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.

Specifications

Parameter Value
Size 80 × 10 mm
Weight 23 g
Shaft type 3mm D, 3mm round, 4mm D, 4mm round
Color black

Resources

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SKU: 76108446997

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Reviewed in the United States on April 11, 2026
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nappydrew
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★★★★★ 5
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Finding a chew toy that can withstand my 70-pound "House Hippo" (an expert-level destructor) for more than ten minutes felt impossible, until we discovered these stuffed shin bones. These treats are an absolute game-changer for long-lasting entertainment, durability, and distraction. Exceptional Durability and Value: The bone itself is thick, natural, and surprisingly sturdy. Unlike processed chews that crumble or get demolished instantly, these last for days of chewing. The value is tremendous because they provide two phases of entertainment: first, the intense effort of licking out the filling, and second, the satisfying work of chewing the bone itself afterward. Irresistible Appeal (Peanut Butter/Cheese Filling): The filling is the secret weapon! My dog goes absolutely wild for the flavor. The filling is firmly packed inside, which means he has to spend a significant amount of time actively working to get every last bit. This intense focus buys me hours of peace and quiet, which is invaluable. On top of that, they offer good nutrition! Less Mess, More Fun: I appreciate that these bones are relatively neat. They don't leave greasy residue all over the carpet like some marrow bones, and the durable exterior means minimal splintering (though, as with any bone, supervision is required). They satisfy my dog's natural chewing instinct while promoting dental health by scraping against his teeth as he works the chew. Final Verdict: If you have an aggressive chewer who needs a serious, long-lasting treat that is both entertaining and structurally sound, look no further. These stuffed bones deliver on their promise and are now a staple in our dog treat rotation!
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Reviewed in the United States on October 4, 2025
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Mandi Mills
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★★★★★ 5
Still Going Strong Months Later
Flavor Name: Bacon, Size: 1 Count (Pack of 1)
These stuffed chew bones have been amazing for my dogs. Even months later, they’re still happily chewing on them, and that says a lot since they’re aggressive chewers. The bacon and cheese filling keeps them interested, and the bones themselves are durable enough to handle their chewing without falling apart. After all this time, the chews are still holding up and my dogs love them every time. They keep my dogs busy, help with dental care, and are definitely worth having on hand for large dogs who love to chew. Durable, tasty, and long-lasting—can’t ask for more.
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Christy
Whiting, US
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Long lasting
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These are the longest lasting bones I have ever purchased. But if you don't want a heavy bone that makes noise when dropped this is not for you. They go sliding across my floor as they are being tossed around and played with. But they love them and they have lasted for months. I am glad they are not as expensive as others. To many things are over priced. Dogs love them.
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Arrived on time and as described
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It is perfect for my 120 lb dog. He did give up after 6 hours of trying to get the “stuffing” out. The bone held up to his chewing. He loved it!
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