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The Trek 3900 is the top model in Trek's 3 Series of hardtail mountain bikes which are designed for beginners.

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Can really take a good beating.

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The Trek 3900 is the top model in Trek's 3 Series of hardtail mountain bikes which are designed for beginners looking to hit the local park or take the long way home. The Trek 3900 has a 100mm suspension fork for comfort and durability for years to come. It also features a full Shimano 8-speed drivetrain and uses various other parts from Bontrager, such as the seat, handle bars and 26 x 2.0" tires. It has a redesigned Alpha White Aluminum frame with semi-integrated head tube, bi-oval down tube with integrated gusset, rack and fender mounts, disc compatible dropouts, replaceable derailleur hanger and is available in sizes from 13" to 22.5" in a Matte Black or Matte Orange finish. The Trek 3900 comes with the option of rim brakes or with more powerful disc brakes as the Trek 3900 Disc.

Specifciations
  • Frameset:
    • Sizes: 13, 16, 18, 19.5, 21, 22.5"
    • Frame: Alpha White Aluminum w/semi-integrated head tube, bi-oval down tube w/integrated gusset, rack and fender mounts, disc compatible dropouts, replaceable derailleur hanger
    • Front: Suspension SR Suntour SF9 XCT V2 w/coil spring, preload, 100mm
  • Wheels:
    • Wheels:
      • Trek 3900: Formula Alloy FM31 hubs; Bontrager 550 rims w/brushed
      • sidewalls
      • Trek 3900 Disc: Formula Alloy DC20 front hub, FH-M475 rear hub; Bontrager 550 rims w/brushed sidewalls
    • Tires: Bontrager LT-3, 26x2.0"
  • Drivetrain:
    • Shifters: Shimano EF50, 8 speed
    • Front Derailleur: Shimano C051
    • Rear Derailleur: Shimano M360
    • Crank: Shimano M191, 42/34/24
    • Cassette: SRAM PG830 11-32, 8 speed
    • Pedals: Wellgo nylon platform
  • Components:
    • Saddle: Bontrager SSR
    • Seat Post: Bontrager SSR, 31.6mm, 20mm offset 
    • Handlebars: Bontrager Approved Riser, 30mm rise
    • Stem: Bontrager Approved, 25 degree
    • Headset: VP-A68-TK, 1-1/8" semi-cartridge, sealed
    • Brakeset:
      • Trek 3900: Tektro V w/Shimano EF50 levers
      • Trek 3900 Disc: Promax, mechanical disc w/Shimano EF50 levers
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