I wonder what the "sprocket" in this image is called, since I cannot find anything like it when I searching for sprocket in an online shop like www.grainger.com or globalindustrial.com.

Is there a specific definition for it?

Sprocket wheel

  • General English doesn't have specific terms for specialized kinds of gears. You'd have to ask on a relevant engineering forum.
    – Dan Bron
    Jun 14, 2017 at 11:00
  • 1
    As @DanBron suggests, try e.g. our sister site, bicycles.stackexchange.com
    – MikeRoger
    Jun 14, 2017 at 11:02
  • 2
    By the way, the correct way to ask the question is what is it called, not how is it called. This seems to be a common mistake of non-native speakers.
    – Barmar
    Jun 14, 2017 at 20:12
  • 1
    Chain sprocket or chainring.
    – Phil Sweet
    Jun 15, 2017 at 19:51
  • It's a sprocket. And probably not a bicycle sprocket, as the configuration is wrong on several points.
    – Hot Licks
    Jun 15, 2017 at 23:01

2 Answers 2


I am unsure if you are looking for a general term, or a description of the actual sprocket in the picture.

The one in the picture is a rear sprocket , specifically a 428 sprocket, a 48T (tooth) 4-bolt rear sprocket for a small motorcycle or moped, possibly a Honda Passport. 428 refers to the specifications of the chain required for the sprocket design.


It’s called a chainwheel. They’re found on bicycles and motorcycles, but the term is used generally.

Here’s a link to a commercial supplier: https://www.babbitt.com/chainwheels/

  • Maybe you mean “chainring” not chainwheel. None of the chainwheels in your link look remotely like the chainring OP has shown.
    – Jim
    Jan 28, 2020 at 20:15
  • The OP is looking for a general term. A general term applies to multiple specific items, which are alike in certain properties, but not in all. A chainring may be part of a chainwheel, but this is like a tire being part of a wheel. We speak of two-wheel drive and four-wheel drive, even though (strictly speaking) it’s the tires that touch the road.
    – user205876
    Jan 29, 2020 at 22:56

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.