Commuter has a broken spoke.
So... last night after ride swapped wheel off nice bike to commuter so I can take the wheel to LBS.
Then removed the wheel as the tyre's a 28 and didn't fit under the commuter mudguard.
Then removed cassette from commuter and fitted to a spare wheel I have.
Then swapped tyre and inner tube to the spare wheel. That wheel has a slightly deeper rim. Is the valve long enough? Yes, methinks.
Pump up tyre. But the pump had can't quite get on enough, only get 20psi in. Remove inner tube.
Search all spare inner tubes on various bikes for a longer valve. Resign myself to removing the inner tube from nice bike tyre, then finally locate one.
Fit new inner tube, to spare, fit to bike, bingo.
If I wasn't such a div I'd have done the right thing first time in 5 minutes.
I think I need to learn how to fit spokes and true wheels.