I would HIGHLY encourage anyone that is out riding when it gets down to the "60s" to carry adequate supplies and if you can, a shelter. The best way to go about this is to probably carry a BOB trailer to put your shelter (one-man tents work great for this) and sleeping bag on. As most of you know, the Pugsly is a great bike for riding on the snow and soft surfaces. There are other options though and Nokian 3.0s are fairly popular as well. Just remember that your gears and suspension could actually freeze out here, the more complex your ride is the more possibility of having something not work. Carry water when you are on the move, but most of all bring an adequate heater with enough fuel. This way you can heat and boil water from the Tempe Town Lake. High energy food is a must and this is something you can't bring enough of. If you didn't bring a shelter, or conditions degrade enough, you might find yourself out there for days waiting for a stoplight to change or the lightrail to move off the road. If you haven't gotten to at least the halfway point and have taken your supplies down a third you should turn back. These days you may be able to rent a satallite phone if any big emergency arises. Luckily in the local area Omniflight (Native Air) provides pretty good coverage. Realize that when you have made the decision to endure this kind of adventure, you may get into trouble and could at least lose some digits due to frostbite. It's a lot better to survive to live the next day, so don't take any chances. There will always be those thrill-seekers that push the limits. Good luck and have fun, but be safe!