Saturday I did a 40 mile ride in a torrential downpour.
During Sunday's sunny 65 mile ride every time I turned the pedals I heard & felt a loud intermittant "CLUNK!" coming from the drivetrain. Almost like chunks of loose metal were grinding/rattling around in my rear hub or bottom bracket. Because I could feel these clunks so palpably in my feet, I was convinced it had to be the bottom bracket.
But just to be certain, I swapped rear wheels with a more-or-less identical model and went for a short ride.
Dead silent. So I conclude it must be the rear hub...and sure enough, by the time I got back from this short test ride, the hub on my original rear wheel had completely siezed up! Couldn't spin the freehub body by hand without employing a lot of torque, and even then it only turned reluctantly as if I was trying to break a glue seal.
So that's my latest cycling-related repair: Getting that rear hub serviced. Took it to the LBS yesterday, they texted me last night to say it's fixed but didn't say what they had to do to it. Genuinely curious.