it’s a threaded cottered bottom bracket. bearing size is usually 1/4″
Lost_Organizations on
No. Something old, but this image contains almost no information that we could use to tell you what you want to know. A cottered crank on a steel bike could be any of a number of different standards.
suchy9013 on
this is old cup and cone bb, you remove the cranks, then the cups and the spidle falls out. you should be able to replace it wth square taber bb, but that will also mean having to replace the cranks
SunshineInDetroit on
oh wow cotter pins. that’s an *old* bike. You could buy the spanner wrenches to remove the outer ring and the main cups if you were intending on just servicing that bike into the future, or you could bring it to a bike shop and have them replace and the crankset. maybe.
lrbikeworks on
This is a job for an old school mechanic. That’s a cotter pin crank and spindle. If it isn’t toast, it will need to be disassembled and repacked with fresh grease snd/or bearings. It takes a certain amount of skill and artistry to adjust a bottom bracket like that properly, and it’s easy to muck it up, which would spell the end of that bracket in very few miles.
Or you could just replace the whole thing (bracket and cranks) with a more modern setup, which would mean spending some money. It would also probably make the bike somewhat functionally better, but also somewhat less interesting.
grungysquash on
And oldie set up, used to replace those dam cotter pins all the time.
Mark700c on
What are you trying to do? Just ID, or overhaul the BB? Is that a hammer coming down on the cotter driving it in tighter?
7 Comments
it’s a threaded cottered bottom bracket. bearing size is usually 1/4″
No. Something old, but this image contains almost no information that we could use to tell you what you want to know. A cottered crank on a steel bike could be any of a number of different standards.
this is old cup and cone bb, you remove the cranks, then the cups and the spidle falls out. you should be able to replace it wth square taber bb, but that will also mean having to replace the cranks
oh wow cotter pins. that’s an *old* bike. You could buy the spanner wrenches to remove the outer ring and the main cups if you were intending on just servicing that bike into the future, or you could bring it to a bike shop and have them replace and the crankset. maybe.
This is a job for an old school mechanic. That’s a cotter pin crank and spindle. If it isn’t toast, it will need to be disassembled and repacked with fresh grease snd/or bearings. It takes a certain amount of skill and artistry to adjust a bottom bracket like that properly, and it’s easy to muck it up, which would spell the end of that bracket in very few miles.
Or you could just replace the whole thing (bracket and cranks) with a more modern setup, which would mean spending some money. It would also probably make the bike somewhat functionally better, but also somewhat less interesting.
And oldie set up, used to replace those dam cotter pins all the time.
What are you trying to do? Just ID, or overhaul the BB? Is that a hammer coming down on the cotter driving it in tighter?