Originally Posted by
juvela
-----
if you are confident of the date then it could not be BSC unless someone has altered it
people at bike shop sound uninformed
BSC cups will start to go in to a CH shell because their pitch diameter is 34.85 and metric/CH thread is 35.0mm pitch diameter
-----
Is there a chance damage has been done to the threading at this point? And I'm not 100% on the date but at least 80%. It's between 1975 and 1977 for sure.
Last edited by polymorphself; 09-02-20 at 06:15 PM.