@
JohnDThompson @
3alarmer The fixed cup has flats spaced 36mm apart.
Now that I have the adjustable cup off I can see what's happened. The adjustable cup is cracked. When I peer inside the 68mm bottom bracket shell I can see that the fixed cup is cracked too around the race. Both are pitted.
The black spindle says 3R Boron J-6 and is longer on the drive side to accommodate the three chain rings I think. The overall length of the spindle excluding the threads is about 128.5mm. The cups/races on the spindle are pitted and worn unevenly which is evident from the silver path the bearings traced out.
The 1/4" bearings (with huge flat spots) fell easily out of the cages, one of which was bent oblong.
Can this spindle be easily replaced? Does the 3R Boron J-6 indicate the sizing including the sizing of the longer drive side?
I like parts to be serviceable, so I prefer to rebuild here with same parts versus purchasing a disposable bottom bracket.