In article <
[email protected]>,
[email protected] says...
> Bear with me, I'll get up to speed eventually. BB length, 108mm, 113mm, or?
>
> How do you choose? Is is based on the crankset, rear hub width, personal preference, flip a coin?
>
> -Bruce
>
>
It is determined by your current chainline (assuming your current one is the proper one). If you
measure from the center of your seat post to the center of the middle ring and it's say 47.5mm,
well you want to have that same measurement with your new BB and/or crankset. Most manufacturers
tell you what BB you need with what crankset to archive a certain chainline. You can also alter the
chainline according to the gears you use most. You might want to got a millimeter or two in out out
to get the chain to follow a straighter path in your top or bottom cog on the cassette. You can't
alter it too much or the front derailleur won't work. If you run a single ring up front, you can
pretty much do what you want but ideally you would want it to fall right in line with the middle
cog on the rear cassette.
--
_________________________
Chris Phillipo - Cape Breton, Nova Scotia
http://www.ramsays-online.com