Single Track Cycles, on the main street in downtown North Bend, is open seven days a week and provides service, sales, and rentals of all types of bicyles, but specializes in mountain bikes.
In addition to bikes, they are also willing to help with other types of wheeled vehicles, like a jogging stroller that had blown a tire, at a minimum cost. For only $10 they sold us a new tube and installed it on our jogger in about five minutes.
They also carry infant helmets, which we've had a hard time finding anywhere else. The itsy bitsy helmet was $30, but actually fits our two and a half year old daughter well.