Chris S
Legendary Member
- Location
- Birmingham
Why is the bearing race on some bottom bracket axles thicker on one side than the other?
Bottom bracket axle bearing races
- Thread starter Chris S
- Start date
Page may contain affiliate links. Please see terms for details.
rogerzilla
Legendary Member
What exactly do you mean by "bearing race" in this context? What type of BB?
OP
OP
Chris S
Legendary Member
- Location
- Birmingham
rogerzilla
Legendary Member
Ah right. I just looked at a 21GC spindle from a Twenty and it's similar. The spindle appears to have been cast in the SA foundry and then just machined at the ends, so it's probably an artefact of that process rather than anything with a purpose.
Raleigh BBs are quite weird, 26tpi threading aside. The fixed cup is unique as it has no flange to stop it being screwed in past the edge of the shell, and hits the centre "step" of the shell instead. It was screwed in tight before the frame was painted, and really was "fixed" as far as Raleigh were concerned. These can be a little stubborn to remove, 50 years later.
Raleigh BBs are quite weird, 26tpi threading aside. The fixed cup is unique as it has no flange to stop it being screwed in past the edge of the shell, and hits the centre "step" of the shell instead. It was screwed in tight before the frame was painted, and really was "fixed" as far as Raleigh were concerned. These can be a little stubborn to remove, 50 years later.