Originally Posted by indygreg
Get a MTB not a road bike. End of civilization/no gas/etc would mean streets are not likely to be maintained.
Also, if all hell brakes loose you can count on a lot of tire popping debris on the roads. Tires would be your #1 concern by far.
That's more likely to occur in the good ol' US of A, which is why I left the US recently. The LA riots give a small foretaste of what's to come there ... good luck.