On 8/30/2019 9:07 PM, Don Gillies wrote:
If a vintage crank needs an offset on one side, you can just add the offset to the other side and substitute a symmetric crankset, so a 116 R+5 bottom bracket can be substituted with a 121 symmetric bottom bracket (120 or 122 would work fine.)

- Don Gillies
Palo Alto, CA, USA


Which makes your tread ( aka "Q") wider.
Deal breaker for some riders.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971