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The Trek 7.9 FX is the top model in Trek's FX Series of cross-trainer bikes. It is designed for comfort first.

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The Trek 7.9 FX is the top model in Trek's FX Series of cross-trainer bikes. It is designed for comfort first, but is also built to perform nearly as well as a road bike. The IsoZone vibration damping system isolates the most pivotal point in the frame and reduces frame vibration between 40-50Hz while the Bontrager Ergo grips and a fitness-specific Bontrager Nebula Plus saddle made from Flex Form elastomer give a long and comfortable with fatigue-free movement. The Trek 7.9 FX features a 10-speed Shimano drive train and uses various other parts from Bontrager, such as a Bontrager Nebula Carbon fork with Speed Trap insert and puncture resistant Bontrager Hardcase tires. The Trek 7.9 FX is the only bike in the FX line to use a full TCT Carbon frame and comes with a Matte Nude Carbon finish in sizes from 15" to 22.5".

Specifications
  • Frameset:
    • Sizes: 15, 17.5, 20, 22.5"
    • Frame: FX TCT Carbon w/IsoZone monostay
    • Fork: Bontrager Nebula, carbon
  • Wheels:
    • Wheels: Bontrager Race 
    • Tires: Bontrager Race Lite, All Weather, Kevlar
  • Drivetrain:
    • Shifters: Shimano R770, 10-speed
    • Front Derailleur: Shimano Ultegra 
    • Rear Derailleur: Shimano Ultegra 
    • Crank: Shimano 105 triple 50/39/30
    • Cassette: Shimano 105 12-27, 10 speed
    • Pedals: Wellgo single-sided, clipless
  • Components:
    • Saddle: Bontrager H2 Flex Form
    • Seat Post: Bontrager Race X Lite, carbon
    • Handlebars: Bontrager Race X Lite, carbon, flat
    • Stem: Bontrager Race Lite, 7 degree rise
    • Headset: Aheadset Slimstak w/semi-cartridge bearings, sealed
    • Brakeset: Tektro RX 3.0 w/Shimano R550 levers
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