Safety is the key in extreme cold. I'd rather swallow my pride than lose a finger. And preparation is the key to safety. Winter cyclists musts have backup plans. This is a good thread because we all should know exactly what we'd do in case we got a flat.
Originally Posted by tokolosh
I have three more ideas:
The fix-a-flat stuff they use for cars work? You'd have to have either schraeder valves or a schraeder valve adapter. Maybe you'd have to keep the stuff inside between trips, and it might mess up your tire/wheel long-term. But it could get you home safely.2manybikes has another good point. Pay a lot more attention to your tire pressure (and all other bike maintenance issues) in the winter. That can help prevent you from needing the ideas in this thread.
If it's too cold to work outside, bring a lock. Lock up your bike, but take the flat tire with you. Take the bus or get a friend to get you where you are going. Fix the flat where it's warm. Take the bus or get a ride back to your bike. Ride home. (If you are lucky enough to live where the buses have racks, just put the whole bike on the rack.)
Bring one of those chemical hand warmers along so you can warm up your hands or equipment as needed.