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Powerfly 9 Plus

£4,200.00 Model 21985
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Experience more

Powerfly e-MTB expands boundaries. We've paired our proven mountain bike design with the reliable propulsion of Bosch pedal-assist e-bike technology in a bike that lets you experience more.

End of the trail? Not for you! Especially if you're searching for an e-bike with the extra power to let you go even further. Powerfly takes you everywhere and a little bit beyond.

Key features

  • Powerful central-mount Bosch motor, for speeds up to 15.5 mph
  • Alpha Platinum Aluminium frame with additional Motor Armor protection
  • Ready for extras: accessorise with lights, mudguards, racks and more
  • The long-life battery is secured within the downtube and is easily removed for charging

More options



  • Frameset

    Alpha Platinum Aluminium, E2 tapered head tube, internal derailleur and dropper post routing, integrated battery, G2 Geometry on 29ers, Boost148
    Front suspension
    Fox Performance 34 Float, GRIP adjustable damper, E2 tapered steerer, Boost110, G2 Geometry w/51 mm offset, e-bike optimised, 120 mm travel
  • Wheels

    Bontrager Powerline Comp 40, 54T Rapid Drive, Tubeless Ready, Boost110 front, Boost148 rear, tubeless strips included, valves sold separately
    Schwalbe Rocket Ron Performance, Tubeless, aramid bead, 27.5x2.80˝
  • Drivetrain

    SRAM EX1, 8-speed
    Rear derailleur
    SRAM EX1
    SRAM EX1, 15T w/chainguard
    SRAM XG-899 11-48, 8-speed
    SRAM PC-1031
    Wellgo nylon platform
  • Components

    Bontrager Montrose Comp, chromoly rails
    Bontrager Drop Line, internal routing, 31.6 mm (15.5: 100 mm/17.5 & 18.5: 125 mm/19.5 & 21.5: 150 mm
    Bontrager Line, 35 mm, 15 mm rise, 750 mm width
    Bontrager Race Lite, lock-on
    Bontrager Line, 35 mm, 0-degree, 60 mm length
    Head set
    FSA IS-2, 1-1/8˝ top, 1.5˝ bottom
    Brake set
    SRAM Guide RE hydraulic disc
  • Accessories

    Bosch PowerPack 500 Wh downtube
    Bosch Purion
    Bosch Performance CX, 250 watt, 75 Nm
  • Weight

    17.5" - 21.84 kg / 48.14 lbs (with tubes)
    Weight limit
    This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Bike and frame weights are based on Trek pre-production painted frames at the time of publication. Weights may vary in final production

Sizing & fit

Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown on trekbikes.com are for general comparison purposes only. To find your perfect fit, visit an authorised Trek retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.


Rider Height

All measurements provided in cm unless otherwise stated.

Frame size number Wheel size A Seat tube B Seat tube angle C Head tube length D Head angle E Effective top tube F Bottom bracket height G Bottom bracket drop H Chainstay length I Offset J Trail K Wheelbase L Standover M Frame reach N Frame stack Frame rise
15.5 in 27.5" 39.4 72.5° 12.0 68.5° 57.9 31.0 4.5 48.5 5.1 8.5 114.8 77.9 38.1 62.7 62.7
17.5 in 27.5" 41.9 72.5° 12.0 68.5° 59.9 31.0 4.5 48.5 5.1 8.5 116.8 77.6 40.1 62.7 62.7
19.5 in 27.5" 47.0 72.5° 14.0 68.5° 64.0 31.0 4.5 48.5 5.1 8.5 121.0 78.1 43.6 64.6 64.6
21.5 in 27.5" 52.1 72.5° 16.0 68.5° 67.1 31.0 4.5 48.5 5.1 8.5 124.3 81.3 46.1 66.5 66.5

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