Originally Posted by
rustystrings61
Until today, when 40-odd miles later I discovered the new mounting cup doing the same thing. Ugh.
So, first question - what causes this to suddenly happen after many years of flawless operation?
Second, bigger question - this BB system is the older symmetrical 109 mm ISO type Miche used prior to 2013, when they switched to JIS taper. With this crank I get a pretty much ideal 42 mm chainline.
If I go to a JIS BB, which pretty much everything is now, will a 103 get me close enough? Or should I just say, “Enough,” and replace the crankset with something else with a more normal BB?
I suspect the thread in the bbkt shell is belled out, my 1979 Holdsworth did the same. As a temporary fix I secured the bottom bracket with epoxy, and used it like that for a couple of years until I had the shell sleeved when the frame was refurbished.