Information regarding UN300 and UN100 (new Shimano Bottom Brackets) - Bicycles Stack Exchange
Tornillo para brazo de biela Shimano eje cuadrado BB-UN26 / BB-UN55 - Zero Bike Store
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