I have a pair of Tifosi that I keep in the car for emergencies, with full frame. The best advice I could give is that they almost certainly won't break, but will be a pain...I've changed them exactly once, and don't want to try again. Which is why for cycling I swear by my Smith Factor Maxes, which I changed in the car the other day on the passenger seat with one hand and without looking down during a decent snowfall to get my rose "snow special" lenses in.
Sit bones = ~135 mm, saddles that work ~ 155cm/6.1 in wide
2003 da Vinci (custom road/all-rounder)/Terry Butterfly Ti
1994 Gary Fisher Nirvana (vintage MTB/commuter)/Terry Butterfly Chromoly
1991 Terry Symmetry (NOS frame/fork, project in progress)
1973 Raleigh Super Course (project in progress)