Shimano Bottom Bracket Parts BB-UN55 BC 1.37 x 24 | eBay
Shimano BB UN55 68mm Bottom Bracket Square Taper - Rebec and Kroes Cycle & Sport
Shimano BB-UN55 bottom bracket British thread (68mm)
Shimano BB-UN55 Square taper Bottom Bracket 70 x 107mm
What is the difference between this Shimano BB-UN50 and the BB-UN55 ? The former is hard to find for sale, the latter seems to be found everywhere : r/bikewrench
Shimano BB-UN55 bottom bracket Italian thread 70 - 107 mm - York Cycleworks