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  1. #1
    Senior Member echo's Avatar
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    Shimano Freewheel Question

    I just received this freewheel and was looking at the teeth and noticed the inconsistencies in the tooth profiles, seems like they are cut differently all over the place...this is about the best pic I can get. If you look closely you can see the differences in tooth width, and the top cut angles on the teeth, is this somewhat normal? or is this a defective freewheel? I must admit I haven't paid much attention to tooth profile on the past freewheels I've had.

    Last edited by echo; 10-17-11 at 09:18 PM.

  2. #2
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    Echo2011: The teeth are cut and shaped that way to aid in shifting. That is completely normal and is characteristic of Shimano's Hyperglide system.

  3. #3
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by dsbrantjr View Post
    Echo2011: The teeth are cut and shaped that way to aid in shifting. That is completely normal and is characteristic of Shimano's Hyperglide system.
    +1. Shimano Hyperglide appeared in 1990. Freewheel and cassette teeth have looked like that since then.
    Jeff Wills

    All my bikes.

  4. #4
    Senior Member Matt Gaunt's Avatar
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    Quote Originally Posted by Jeff Wills View Post
    +1. Shimano Hyperglide appeared in 1990. Freewheel and cassette teeth have looked like that since then.
    +2. If you're interested, there is a Shimano video, on how they designed it and why the teeth are shaped individually, on YouTube. Search "Shimano Hyperglide" and it's the first hit. (Sorry, work block YT).
    Matt
    2010 Kinesis Decade Convert2 Alloy fixie, Miche, Sora Pics soon...
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  5. #5
    Senior Member echo's Avatar
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    Thanks guys, much appreciated!

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