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Old 11-09-10, 10:49 PM
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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.

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