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 - YouTube
FAQLoad - Shimano BB-UN55 bottom bracket
Каретки shimano bb-un55 — купить по низкой цене на Яндекс Маркете
NEW SHIMANO SEALED CARTRIDGE BOTTOM BRACKET / BB-UN55 / 68 X 127mm | eBay