Rather be riding
Join Date: Jun 2008
Location: Centennial, CO
Bikes: Motobecane Le Champion Ti & Trek 5500
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Fine sand in the bottom bracket?
My crank recently became stiff to turn on my cross bike (only 10 mo old). I took it apart and found about a teaspoon of really fine sand/dirt inside. After cleaning and lubing it's back to it's normal self. But I'm left with a head-scratcher - how did it get in there?
Granted we've had some huge gully washers here in Denver lately, and I've gone through some deep mud and sand next to the creeks on my commute. Thinking that the dirt and grit may have gotten in the seat post and fell down the seat tube, but no, it's not open. I can't find any openings on the frame (Motobecane Fantom Pro Cross). Could that amount of dirt gone through the clearance between the crank and bearings? Seems unlikely to me. Any ideas where I can look for the answer anyone?
Related question - how often do y'all tear down and clean the bottom brackets when you're riding in dirt and mud occasionally?