2010 Trek 3900 All Terrain Mountain Bike-Pat's 605 Cyclery- Norwalk, CA. - YouTube
Trek 3900 Disc Mountain Bike | Bikes.org.uk
my upgraded 2010 trek 3900 by mtbboyvt on DeviantArt
Thanks Crane Creek! I installed a tapered fork into my Trek 3900 (non-tapered frame). I'm a mountain biker on a strict budg… | Mountain biker, Mountain biking, Bike