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What exactly is ideal "chain line?"(2 posts)

What exactly is ideal "chain line?"KLM
Feb 2, 2002 10:10 AM
I know it has to do with a measurement from the "theoretical centerline of the seat tube" to one of the chainrings, but how does this relate to the cogs and how do I adjust/alter it?

Thanks in advance for your advice,
Ken
not related to seat tube...mickey
Feb 2, 2002 2:02 PM
The ideal chain line centers the chainrings with the center of the cassette cogs.

In most cases you can't alter the chainline. Only a few bottom brackets are made with side to side adjustment. If the frame is built correctly and you use the correct spindle length for your crank arms, all should be well.

More info can probably be found at www.sheldonbrown.com (Harris Cyclery).