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Dura Ace Hub and MICHE COG

Old 05-05-07, 09:29 AM
  #1  
vee_dub
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Dura Ace Hub and MICHE COG

Hey guys, I am shopping around for the cog thinking should i get Miche Quick-release one or just ordinary screw on. But my main concern is would they fit on dura-ace hub???
Is miche italian thread or Japanese??

Cheer,
Dub.
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Old 05-05-07, 10:09 AM
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tovi
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stolen from fgg:

Miche Hubs and cog-carriers use Italien threading which is 35mm*24tpi (1.378 inch), while Shimano, Formula, Suzue, Phil, etc. use BSA threading 1.370"*24tpi - which translates to 34.798mm*24tpi. Also, and i hope i'm using the correct english terms here, the thread angle on a BSA thread is 60 degrees, radius 0.17mm, while on ITA it's 55deg and 0.14mm.

These differences are tiny, and as you said, an italian threaded cog (Miche or Campy) will thread on a regular BSA hub, but as you can see the italian thread diameter is slightly larger than BSA. This reduces the contact area, and could very well increase the risk of a stripped hub.
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Old 05-05-07, 10:50 PM
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Above info is all correct. Few people have had anything nice to say about the miche system for anything but dedicated track use, FWIW.
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Old 05-06-07, 06:24 AM
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roscoenyc57
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I've got the Miche system on two sets of D/A hubs (one high, one low) and it has worked fine for me. The lockring is the only thing that I take off to change cogs and I'm using the D/A for that.
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