GRX600
I think maddog was right about the bearing. Drive side though. Feels awful. Maybe I didn’t replace it when I thought I did. This bike has hardly seen any water this winter….. oh hang on…

there was that flooded road 3-4 months back where we actually had to fully pedal through it. I thought I’d got away with that and totally forgot about it until now, high clearance on a gravel bike & all that. Maybe the BB got a dunking after all.