Bottom bracket Shimano un55, 70/122mm. With bolts _ - AliExpress Mobile
Shimano BB-UN55 Bicycle Bike Square Bottom Bracket 107-127.5mm Sealed Cartridge Bearing - AliExpress Sports & Entertainment
Shimano BB-UN55 Bottom Bracket 68 x 107mm - BSA (English) - JIS Square Taper | eBay
Repacking a Shimano BB-UN55 - Bike Forums
Shimano BB-UN55 Square Tapered Bike Crank Bottom Bracket 68 x 122mm NEW - Walmart.com
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