Lots of bike shops in Denver. The Bike Source is a great HUGE shop on County Line Road and University. The Denver Spoke has been around for many many years. Weatridge cyclery is also very large. There's also Bicycle villiage and a Supergo shop. Excel Sports, the one with the catalog that eveyone gets, is in Boulder and the Louisville Cyclery is a nice shop too. There's a ton of shops, just check the phone book.