One day bike rental for two people with with Chile Pepper Bike Shop in Moab, Utah.  

If you are planning a mountain biking vacation and Moab is one of your stops or your main destination, Chili Pepper Bike Shop can offer advice to help make your Moab mountain biking experience to this beautiful red rock
desert a memorable one.  We have top quality rental bikes and equipment, purpose built for Moab
mountain biking.  We also offer a full-service repair department with highly trained mechanics to assist you if your bike is  in need of repair.  Mountain biking in Moab is famous for breaking parts and/or bikes (but don’t be scared!)

http://www.chilebikes.com/