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Old 05-27-11, 10:57 PM   #1
Kommisar89
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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?
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Old 05-27-11, 11:14 PM   #2
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Easy - the freewheel body is splined.

-Kurt
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Old 05-27-11, 11:18 PM   #3
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And, the cogs are interchangeable/customizable.........just like cassettes. Dandy.
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Old 05-27-11, 11:39 PM   #4
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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.
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Old 05-27-11, 11:46 PM   #5
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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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Old 05-27-11, 11:53 PM   #6
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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.
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Old 05-28-11, 01:16 AM   #7
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That's what the big notch is for. Is that the issue?
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Old 05-28-11, 07:40 AM   #8
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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

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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
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Old 05-28-11, 08:55 AM   #9
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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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