Topic starter
I replaced the bearings on my xtr crankset last week, and I just realised that I re-fitted the bottom bracket cups but forgot to include that plastic sleeve that connects then within the frame's bb shell.
What does this do?
I went for a pretty serious (and wet) ride earlier in the week, as well. I'm going to replace it in any case so I guess it's more a case of curiosity as to what its purpose is.
Posted : 09/04/2011 8:56 pm
To stop water getting in from the seat tube to the inner bearing seals
Posted : 09/04/2011 9:19 pm
It's just for show 😉
Posted : 09/04/2011 9:22 pm
as mtbtomo said. It has fine 'O' rings either end that seal in the BB cups, preventing water getting in. Quite an important part of your BB 😉
Posted : 09/04/2011 9:39 pm
Topic starter
Thanks all.
Posted : 09/04/2011 10:07 pm