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 '17 at 11:00
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    As @DanBron suggests, try e.g. our sister site, bicycles.stackexchange.com – MikeRoger Jun 14 '17 at 11:02
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    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 '17 at 20:12
  • Chain sprocket or chainring. – Phil Sweet Jun 15 '17 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 '17 at 23:01

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.

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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/

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  • Maybe you mean “chainring” not chainwheel. None of the chainwheels in your link look remotely like the chainring OP has shown. – Jim Jan 28 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. – Global Charm Jan 29 at 22:56

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