empowering creative people

Pololu 42x19mm Idler Wheel/Sprocket Pair - Black


$8.77 AUD, inc GST
$7.97 AUD, exc GST

More Views

Pololu 42x19mm Idler Wheel/Sprocket Pair - Black
8.77 AUD


$8.77 AUD, inc GST
$7.97 AUD, exc GST
In stock, with a short lead time. 5 units dispatch in 4 to 9 days (in addition to the shipping method you choose). Our timing and stock is accurate. Delivery to you by Wed, 7th of Mar with Express Post within Australia.
Shipping Offer


These idlers have 3.5 mm diameter circular holes that allow them to spin freely when used with the included shoulder bolts or similar mounting hardware. The plastic hubs are the same as the idler sprockets included with the Pololu 22T and 30T track sets, and they can be used with the 30T track set as additional idler sprockets:

They can be used with the included rubber tires as idler wheels that have the same overall dimensions as Pololu's 42×19mm wheels:

This product includes two idler sprockets/hubs, two rubber tires, and mounting hardware consisting of two shoulder bolts, two M3 nuts, and two washers. The idler sprocket/wheel can be mounted with the provided shoulder bolt as shown in the diagram below. (The red block represents a bracket or chassis that the sprocket is being mounted to, and is not a part included with this product.) Pololu's nylon spacers can be used to offset the idlers from a flat mounting surface.


  • Hub diameter: 1.38" (35 mm)
  • Wheel diameter: approx. 1.65" (42 mm)

The diagrams below show the dimensions of the hubs and the included shoulder bolts. (Note that the hub diagram is actually the diagram of a drive sprocket; the labeled dimensions are all the same for the idler version, but the center hole is circular for the idler hubs, not D-shaped, and there is no strain-relief slit.) The threaded portion of the shoulder bolts can be cut to the desired length.

Documentation and Resources:

Product Comments

We deliver Australia-wide with these options:

  • $3 for Small Items (4-6 days, not tracked, only available on selected small items)
  • $6.95 for Standard Post (2-4 days, tracked)
  • $8.95 for Express Post (1-2 days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (only after we email you to notify your order is ready)

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11.49 for Pack and Track (3+ days, tracked)
  • $16.50 for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount might increment based on the weight of your order.

Our physical address:

Unit 18, 132 Garden Grove Parade
NSW, 2289

Please checkout our customer service page if you have other frequently asked 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.