Shimano BB-UN55 Bottom Bracket 68 x 107mm - BSA (English) - JIS Square Taper | eBay
Shimano BB-UN55 Square taper Bottom Bracket 70 x 113mm
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