That annoying mudguard rubbing that only comes under load...
https://www.cyclechat.net/threads/tales-from-todays-commute.105055/page-2199#post-7043178
... took the rear wheel off to investigate.
Couple of shiny patches on inside of mudguard, made some adjustments, same thing. Still only under load.
Took wheel off again, no obvious play in the bearings, but seemed to have slight wobble on freehub. Have it a wiggle, then another, then another and...
...hub fell apart in my hands, rear axle had snapped.
View attachment 703093
Presumably was flexing under load as a result. I keep a spare, swapped cassette, went to swap tyre and tube...
... valve core fell out. Couldn't find it, binned tube, finally everything back together, reindexed gears, good to go.
New wheel needed. Actually probably two, 'cos the spare is pretty much bollixed too.