Great start to the day, go into the garage and the ice bike has a rear flat. Decide not to find the offender (suspected a stud had come through the tyre) so whipped off the tyre and put a new one on. Pumped it up and off I go.
Get round the corner and the back wheel locks up. Tyre had come off the rim and jammed against the frame. Carry the bike home, let the tyre down and refit it.
Set off again, get a few hundred yards, something doesn't feel right, get off give the tyre a squeeze, nope it's inflated okay, give the tyre a push and the whole wheel wobbles. Tighten the quick release properly and back on my way
No further dramas for the rest of the trip.
Got home, hung up the ice bike, got the normal commuter ready for an ice free day tomorrow. Found the offending stud on the original tyre, so that will now be kept as a spare (the tyre not the stud)