VP Bottom Bracket English Thread Square Taper 73mm X 122.5mm BB Un26 Un55 for sale online | eBay
Finally got around to replacing a UN26 BB with a UN300. I was shocked at how decent this thing is for $20. Bearings are the same size carts as Phil Wood. But
Shimano Crank Arm Fixing Bolt for BB-UN26 / BB-UN55 Square Taper Bottom Bracket - Y15507000
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