Pololu Aluminum Scooter Wheel Adapter for 4mm Shaft

SKU: POLOLU-2672 Brand: Pololu
This two-part aluminum assembly mounts directly to 4 mm diameter motor output shafts like those on Pololu's 25D mm gearmotors and allows you to drive most scooter, skateboard, inline skate, and other common wheels that are compatible with popular 608 ball bearings. Two M4 set screws are included for securing the threaded adapter piece to a motor shaft, and three 14 mm M3 screws are included for clamping the wheel between the threaded adapter piece and the washer.
$10.05 AUD, inc GST
$9.14 AUD, exc GST

In stock, ships same business day if ordered before 2PM
Delivered by Thu, 18th of Apr

Quantity Discounts:

  • 10-25 $8.86 (exc GST)
  • 25+ $8.68 (exc GST)
- +

3 from local stock, 1 supplier stock; your order will dispatch between Dec 1 to Dec 10. And yes, stock levels and lead times are accurate!

Shipping:

  • $6+ Standard (5+ days*, tracked)
  • $10+ Express (2+ days*, tracked)
  • FREE Pickup (Newcastle only - must order online*)

Shipping costs may increase for heavy products or large orders.

Exact shipping can be calculated on the view cart page.

*Conditions apply, see shipping tab below.

This compact aluminum adapter assembly makes it easy to use many common scooter, skateboard, and inline skate wheels with motors with 4 mm diameter output shafts, enabling many more wheel options for your project. It works with most wheels that are compatible with standard 608 bearings, such as Pololu's selection of scooter/skate wheels.

The adapter consists of two main components: a machined piece with threaded holes that mounts to the motor shaft using the two included M4 set screws, and a flat washer that clamps the wheel to the machined piece using the three included 14 mm M3 screws.

Note: Some wheels, such as Pololu's 144 mm scooter/skate wheel and 200 mm scooter/skate wheel require longer screws than the ones that are included. The included 14 mm screws are long enough for the other scooter/skate wheels Pololu carry.

The washer has a hole in the center that allows the motor’s output shaft to optionally pass through for added flexibility in wheel placement on the shaft, and the low profile of the machined piece lets it work with wheels that have as little as 6 mm of space between where the 608 bearings normally fit.

Pololu also carry versions of this adapter for 5 mm motor shafts, for 6 mm motor shafts, and for 1/4 inch motor shafts.

Using the adapter

Exploded view of the scooter wheel adapter assembly with a gearmotor and scooter wheel.

The adapter is straightforward to use when assembled in the proper order. First, slide the threaded shaft mount onto your motor’s output shaft with the narrower part facing away from the motor and tighten the set screws. (If your motor has a D-shaft, make sure you align the set screws with the flattened portion of the shaft.) Once this piece is secured, press the wheel directly onto it. Next, align the holes of the washer with the threaded holes of the shaft mount and press the washer into the recess on the other side of the wheel. The diameter of the washer is slightly smaller than that of the threaded shaft mount, so the orientation of the washer should be easier to adjust if the holes are not quite aligned. Finally, insert and tighten the M3 machine screws so the adapter clamps the interior flange of the wheel, making sure to tighten them evenly rather than one at a time.

The machined piece of the 4 mm scooter wheel adapter mounted to the output shaft of a 25D mm gearmotor.

A 25D mm gearmotor connected to a scooter wheel by the 4 mm scooter wheel adapter.

Note: For some wheels, it might be difficult to push the washer into the wheel with your bare hands. In such cases, an alternative approach is to initially use longer M3 screws to engage the threads of the machined piece. You can then tighten the parts together, making sure to tighten the three screws evenly so that the washer stays parallel to the threaded piece. When the longer M3 screws cannot be tightened further, you can replace them with the included 14 mm screws and finish the assembly.

Dimensions

This adapter is intended to work with motors with 4 mm diameter output shafts, and it fits most wheels that are compatible with standard 608 ball bearings. Please see the dimensions below to confirm that it will work with a particular wheel.

Dimension diagram of the Pololu aluminum scooter wheel adapter threaded mount for 4 mm shafts. Units are mm over [inches].

Dimension diagram of the Pololu aluminum scooter wheel adapter flat washer. Units are mm over [inches].

These drawings are also available as a downloadable pdf (154k pdf).

People often buy this product together with:

Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack)Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack)
Pololu 25D mm Metal Gearmotor Bracket PairPololu 25D mm Metal Gearmotor Bracket Pair
Scooter/Skate Wheel 70×25mm - BlackScooter/Skate Wheel 70×25mm - Black

Dimensions

Weight: 15.1 g1
Shaft diameter: 4 mm

Notes:

1
Includes machined piece, washer, M3 screws, and set screws.

File downloads

Product Comments

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If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

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