^That is all really good stuff. I relied on a bead jack to mount my tires and that bead jack cracked the first and only time I used it in the negative cold. I agree that flats are rare - the only flat I have gotten which required roadside repair was caused by a microscopic wire that came from nowhere.
The other thing that has not been mentioned is breathing. I have no problem with breathing in the bitter cold but only if I ride all year. It has been a while since I did not ride into the winter but I recall pretty much choking at 10°F.