When I am riding on my trainer, and I am doing 100% ftp there is some clunky/grinding feeling in my drive train (pedaling) at lower cadence below 75 but when I spin above that it smooths out and no grinding type feeling/noise. This does not happen when I ride at lower ftp. Any thoughts, is this normal?
Replace your bottom bracket immediately. Today.
I speak from experience. Good luck.
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Took it to the LBS and waiting to hear back thanks!