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Old 07-06-20, 09:35 AM
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Sjtaylor
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Chain Line Question

I just finished installing an outboard bearing bottom bracket spindle, the one with three spacer washers. It’s on the Trek 720 frame I’ve been posting about. It has a 68mm long bottom bracket.

You're supposed to put two of the washers on the drive side. I notice that the chain line at the chain rings is outboard of the chain line at the cassette. I also notice that crank arms are not the same distance from the chain stays. The drive side crank arm is further away from its chain stay.

The chain rings seem to be plenty far away from the frame so why shouldn’t I move one or two of the bottom bracket spacer washers to the non drive side to improve the alignment? I realize that with the longish chain stays that excessive cross chaining probably isn’t a concern. Mostly just like to take advantage of a learning opportunity.

Thanks.
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