Thread: Bottom bracket type
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Old 03-26-21 | 02:09 PM
  #5  
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oldbobcat
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From: Boulder County, CO

Bikes: '80 Masi Gran Criterium, '12 Trek Madone, early '60s Frejus track

Originally Posted by jfny1978
I found one that is 73x122. Will that work? Anyone have any idea what the L in the 73L means? I assume Large, but not sure what that would mean.

Thank you.
Nope, the overall length should match within one millimeter. At best, the short spindle will screw up your chainline for smooth shifting and driveline. At worst, it will jam the inner chainring into the chain stay.

All 73 mm bottom brackets are BSA (English) threaded and JIS taper. Right now Shimano has discontinued their BB-UN26 and BB-UN55 units, replacing them with BB-UN300. Distribution of these looks spotty, so you may have to settle for brand-X. Good luck.
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