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Knocking sound
#1
When I ride in a fairly low gear, about the 4th or 5th easiest gear and am peddling pretty hard, I hear a knocking sound that sounds like the bottom bracket, difficult to tell though. When I ride harder in even lower gears, it doesn't knock. Very confusing. I've just had a major maintenance completed at a good shop but it still happens. Any ideas out there about what it could be? Thanks!

Dan
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