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Bottom Bracket Measurement(3 posts)

Bottom Bracket MeasurementRickF
Aug 15, 2002 5:13 AM
I'm trying to build up an old Paramount OS frame that I've had stored away for years and am wondering how to measure for a new bottom bracket.
Two things.Spoke Wrench
Aug 15, 2002 5:23 AM
Measure the width of your bottom bracket shell. On your paramount it will almost surely be 68mm. That's the first pertinent BB measurement.

The second measurement, spindle length, is mostly determined by the requirements of the crankset. If you are using one of the newer, Shimano splined cranksets, you only have two choices: 109.5mm for doubles and 118.5mm for triples.
Two things.RickF
Aug 15, 2002 4:40 PM
Thanks. 68x109.5 it is.