Superfly 20 | Trek Bikes (AU)
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Superfly 20

$499.00 Model 17163

Superfly 20 is a great first step for young riders looking to try mountain biking. It has an Alpha Silver Aluminium frame that's lighter and easier to manoeuvre than most kids' bikes, and 20˝ wheels that make it a great fit for kids who are 115-133 cm/45-52˝ tall. Simple, quality components make Superfly 20 an ideal way for your kids to ride off-road with comfort and control.

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It's right for you if...

You want your little ones to experience real mountain biking with real mountain bike parts. You want an entry-level MTB that's simple and easy to handle so you can all ride the trails as a family and set the foundation for a lifelong love of adventure. 

The tech you get

This bike isn't just a load of adult parts slapped onto a small frame. All components on this bike feature our Dialed Fit. That means you're getting the right crank length and the right saddle, bars and grips for kids. It also has fast and sturdy Bontrager XR1 tyres, and a simple 6-speed twist shift drivetrain to keep kids rolling.

The final word

Superfly 20 is the ideal entry point for young riders who want a bike they can ride on- or off-road. It's simple enough for beginners, but built with a quality frame and adjustable features that can grow with them. 

favorite_borderWhy you'll love it

  1. The frame of this bike is super light, so it's easy for young kids to manoeuvre, which adds to overall ride confidence
  2. This is the perfect introduction to the trail, with MTB-ready parts that will have your kids' mastering the singletrack in no time
  3. Superfly 20's simple 1x6 twist shift is easy for kids to understand, so they won't get frustrated when learning how to change gears
  4.  We love getting more kids out on the trail, and this entry-level bike will introduce young ones to a healthy hobby that they'll love for years to come



  • Frameset

    20˝ Dialed frame size, Alpha Gold Aluminium
    Dialed 20˝, alloy
  • Wheels

    Front hub
    Formula TK31 alloy
    Rear hub
    Formula FM31 alloy
    20˝ 32-hole alloy
    Bontrager XR1, 20x1.85˝
  • Drivetrain

    Shimano Tourney RS35, 6-speed twist
    Rear derailleur
    Shimano Tourney TY300
    Alloy, 32T
    Bottom bracket
    Sealed cartridge
    SunRun freewheel, 14-28, 6-speed
    KMC Z50
    Dialed 9/16˝, platform
  • Components

    Dialed 20˝ size, padded
    Bontrager, 2-bolt head, 27.2 mm, 8 mm offset
    Bontrager alloy, 31.8 mm, 15 mm rise
    Dialed, Kraton
    Bontrager Elite, 31.8 mm, 7-degree, w/computer and light mounts
    Head set
    VP 1-1/8˝, semi-Integrated
    Brake set
    Alloy linear-pull, Dialed alloy levers
  • Weight

    8.16 kg / 17.99 lbs
    Weight limit
    This bike has a maximum total weight limit (combined weight of bicycle, rider,and cargo) of 36 kg (80 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 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.

Effective seat tube angle D — Head angle E — Effective top tube F — Bottom bracket height H — Chainstay length J — Trail K — Wheelbase L — Standover M — Frame reach N — Frame stack
72.0° 70.0° 44.5 23.5 36.3 4.8 86.25 51.75 28.8 48.3

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