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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 03-06-06, 11:02 AM   #1
46x17
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Tange Headset Difference

Quick question,

Tange Levin threaded headsets come with either 27.0mm or 26.4mm races. What dictates which race diameter I should get? Stem?
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Old 03-06-06, 11:14 AM   #2
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Those numbers refer to the crown race diameter, JIS and ISO respectively.

So, measure your crown race.
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Old 03-06-06, 11:18 AM   #3
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If you're replacing a 27.0mm headset, you might be better off getting your fork crown cut down to take a 26.4mm race. I think the only options for 27.0mm headsets are the steel Levin and the pricey Hatta Swan. Both are fine, but if you don't want to deal with maintaining a loose ball headset you'll have a lot more options to choose from in the world of 26.4mm crown races.
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Old 03-06-06, 11:24 AM   #4
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That is an excellent suggestion, m. I socred a NIB 105 headset for cheaps [$10!], and had the lbs mill the crown race down to 26.4 from 27.0, to fit the headset. I think it cost me something like $10. That was over a year ago, and there have been no problems whatsoever.

I think shimano makes some threaded headsets with a JIS crown race. At least, that's what the spec/instruction sheet seemed to imply which came with shimano 105 headset.
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