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Another chainline question

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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)

Another chainline question

Old 11-09-10, 10:49 PM
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diff
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Another chainline question

Lets take these 2 cranks and matching bb.

Sugino RD - 103mm BB spindle

Sugino 75 - 109mm BB spindle

According to what I have googled, these both produce a 42mm chainline. How? Wouldn't the Sugino 75 stick out 3mm more on each side?

Or is it just based on how the cranks themselves are formed and how they fit into the bottom bracket, and spindle length means very little?

Want to swap the cranks on my steamroller. The current bottom bracket is 103mm spindle, so a bit confused on what cranks I can use.

Thanks.
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Old 11-09-10, 10:53 PM
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Squirrelli
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They are of two different kinds of spindle, RD one is JIS and the 75 is ISO. Sheldon's got an article about their interchangeability.

You need to change your spindle length according to what the new crankset need.
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Old 11-09-10, 11:15 PM
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diff
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Ah makes sense. Had a feeling it was the way they fit together that made the final size.

Thanks.
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