I've replaced a few BB's due to wear.
I notice by an annoying click under load.
Swap out the pedals first since it's easier, if the click doesn't go away, then BB swap.
Usually 10k miles for me but a lot of dirt in involved.
pdlamb
HillRider
Thanks for the Teflon tape advice.
Never thought of that.
(also, if it's the older ball and cup design, I try to overhaul it, if it's a cassette, swap the whole thing)
((my last swap was for a bike with Power Spline))
((($15, whoot!)))