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I think the Chain Box one has a flange on the drive side, to hold on a chain retention device (box?), or an 'E-type' derailleur like this:
chez_jay-
Thank you.
Related to this: BB-UN100 comes in versions for 47.5 and 50.0mm chain line. Sheldon mentions something about oversized tubing requiring a 50.0mm chain line BB. It's an aluminum frame, how do I know if it's 'oversized'?
The chainset I want to pair it with says 47.5mm chain line in the specs. Should I just get the 47.5mm chain line BB?
It's for a TREK Aluminum 7300. Can't find a bloody thing about this bike online.
Any help would be appreciated.
Tijs
Looking at the Shimano BB-UN100, there are two options:
Can someone explain the difference? What's the relevance of a chain box for a bottom bracket?