As an Arizona native I just want to strongly second what Luke has said. I highly suggest having a camelback filled with water that you can sip on while you're riding. I always wear my 100oz Camelback Mule on longer rides. On some multi-hour rides it isn't uncommon for me to consume more than a gallon of water and still not pee a whole lot. The warm, dry air here really pulls the water out of you.TwoLukes said:For those coming from more humid climates, a note of caution. Stay hydrated! Plan on carrying at least a gallon of water on any dirt involved ride and maybe 2 for the Toroweap Lookout run. The first sigh of dehydration is a headache out here, and then you're behind the power curve trying to drink to catch up... You don't sweat out here in the "dry heat" but you're losing water, even while you sleep as it's very common to have single to low teen humidity numbers. Many buy a simple gallon jug of water with a screw on lid for one of their boxes. The road trips will stop and have cold beverages along the way, but don't forget it is Utah.