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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 12-17-07, 10:46 PM   #1
nelzar13
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Iro btm bracket

im in the market for a bottom bracket thats goin on a iro mark V. (doesnt need to be anything fancy)It will be matched up to a track hub spaced at 120 any one know the size btm bracket i need to get my once again perfect chain line?
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Old 12-17-07, 11:06 PM   #2
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what crank?
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Old 12-17-07, 11:07 PM   #3
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this one, maybe?
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Old 12-17-07, 11:13 PM   #4
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Originally Posted by baxtefer View Post
what crank?
say, sugino 75s
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Old 12-18-07, 12:50 AM   #5
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That 110mm spindle is too long for 75's not to mention the wrong taper...you need a Sugino superlap BB. I think they're 107mm and ISO NOT JIS taper.
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Old 12-18-07, 01:20 AM   #6
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109 symmetrical iso for 75s..

see here for track cranks: http://www.businesscycles.com/tr-refspec.htm

road cranks probably a 107 or 103 depending on chainstay clearance
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Old 12-18-07, 05:35 AM   #7
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a set of purely gangster bullet proofs!
lol
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Old 12-18-07, 12:27 PM   #8
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It looks like this should give you the information you need.

For a 42mm chainline, you could use a 111mm spindle with the ring on the inside of the spider. (someone check me on that?)

For future reference, chainline measurements have everything to do with the type of cranks, bottom bracket and hubs. The frame is not a factor.
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Old 12-18-07, 03:30 PM   #9
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ahhh yes that quick fix that should hook me up i do believe thank you kind sir
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Old 12-18-07, 07:32 PM   #10
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I don't think 111mm is available in anything reasonable (Campy makes one, but fughedaboutit). A 109 or 113 should be close enough, assuming it's symmetrical.
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