Questions tagged [hyperglide]

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14
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1answer
2k views

What are the ridges seen on sprockets and chainrings for?

I've always wondered what these ridges below the teeth on sprockets are for. Can anyone enlighten me?
4
votes
1answer
583 views

What does marking like “aq/ar” on the sprocket mean?

Shimano sprockets are marked with short strings like "aq/ar", "bg", "as/au/be" and others. For example, "bj bk" can be read on the image below: It looks like they mean the hyperglide series to which ...