If you're using a flanged BB (e.g. on the fixed cup) PTFE will be helpful as it enables you to apply greater locking force to the cup. It seems counter intuitive, but by decreasing thread friction you can obtain greater force between BB shell & cup flange.
If you're using a flanged BB (e.g. on the fixed cup) PTFE will be helpful as it enables you to apply greater locking force to the cup. It seems counter intuitive, but by decreasing thread friction you can obtain greater force between BB shell & cup flange.