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  1. #1
    Bottecchia fan
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    How are the cogs aligned on a Shimano Hyperglide freewheel?

    This has been bugging me for a while. Older freewheels, even up through Uniglide twist tooth freewheels, did not need to have the cogs aligned and modern cassettes have keyed, splined freehub bodies to align the cogs but how did they do that with the Hyperglide freewheels?
    1959 Bottecchia Professional (frame), 1966 Bottecchia Professional, 1971 Bottecchia Professional (frame),
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  2. #2
    www.theheadbadge.com cudak888's Avatar
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    Easy - the freewheel body is splined.

    -Kurt

  3. #3
    Senior Member
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    And, the cogs are interchangeable/customizable.........just like cassettes. Dandy.

  4. #4
    FBoD Member at Large khatfull's Avatar
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    Physically yes but for optimum shifting HG requires particular teeth to be in the proper orientation with each other, swapping cogs may not preserve that orientation.

  5. #5
    Bottecchia fan
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    Hmmm...so I wonder how a modern IRD freewheel is built? I've heard it is a copy of a Dura Ace design.
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  6. #6
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    Quote Originally Posted by khatfull View Post
    Physically yes but for optimum shifting HG requires particular teeth to be in the proper orientation with each other, swapping cogs may not preserve that orientation.
    Yeah, I understand what you're saying, but Harris Cyclery didn't really comment on that when I asked them about it. They just said,"Yes, they're interchangeable". I figure it's the same as with a cassette, though. Probably lose the ability to index, but friction shifting'll be alright. I don't know.....I'll find out once I can fork over some cash to play around with a couple.....building half-steps, and all.

  7. #7
    RFC
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    That's what the big notch is for. Is that the issue?

  8. #8
    FBoD Member at Large khatfull's Avatar
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    Hyperglide (HG)

    A system of ramps and special-shaped teeth on Shimano rear sprockets that permits much smoother shifting than older systems. HG sprockets are designed so that, as the chain moves from one sprocket to the next, it will engage the new sprocket before it has completely derailed from the old one. This makes for smooth, silent shifting.

    Hyperglide requires that the teeth of adjacent sprockets be oriented specifically with respect to one another. It also reduces interchangeability to some extent. For example, a 17-tooth sprocket that is designed to be used next to a 16 tooth sprocket will be shaped differently from one designed to be next to a 15 tooth.

    That doesn't mean that you can't customize a Hyperglide cassette, but does mean that if you do customize, you will lose the Hyperglide functionality for some of the shifts.
    http://sheldonbrown.com/gloss_ho-z.html#hyperglide

    To provide the Hyperglide functionality, each sprocket must be designed with regard to the adjacent sprockets. For instance, there are 3 different 15 tooth sprockets for 7-speed systems: one version works between a 13 and a 17; another works between a 14 and a 17; another works between a 14 and a 16.
    http://sheldonbrown.com/k7.html

  9. #9
    Senior Member Captain Blight's Avatar
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    This is why I'm not a huge fan of HG; I want the chain to move when I tell it to, not when the shifting ramp comes around.
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