Measured my existing BB (pic1) and it landed between 122 and 123mm. Guess it's a 122,5mm right? Shimano UN-300 seems to have two models D-NL and LL123. What's the difference? I've also
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