New Paltz Biking is a fantastic operation in the parking lot at the entrance to the Wallkill Valley trail.  They have bikes and gear for all bikers.  They are super helpful and very convenient.

Bicycle Depot on Main Street in New Paltz is the bike shop with everything from rentals to high-end bikes and everything in between.  The staff is friendly and knowledgeable, and their location is right on the bike trail.