Superfly 20


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GTIN (UPC): N/A Categories: ,

Key features

  • Better than big box bikes, and your kid deserves it
  • The frame and parts are dialed to fit kids right from the start
  • Fun, kid-friendly details come standard
  • Trek quality = safety and fun


Frame 20˝ Dialed frame size, Alpha Gold Aluminium
Fork Dialed 20˝, alloy


Front hub Formula TK31 alloy
Rear hub Formula FM31 alloy
Rims 20˝ 32-hole alloy
Tyres Bontrager XR1, 20×1.85˝


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


Saddle Dialed 20˝ size, padded
Seatpost Bontrager, 2-bolt head, 27.2 mm, 8 mm offset
Handlebar Bontrager alloy, 31.8 mm, 15 mm rise
Grips Dialed, Kraton
Stem Bontrager Elite, 31.8 mm, 7-degree, w/computer and light mounts
Head set VP 1-1/8˝, semi-Integrated
Brake set VP 1-1/8˝, semi-Integrated


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.

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.

Wheel size ASeat tube BSeat tube angle CHead tube length DHead angle EEffective top tube GBottom bracket drop IOffset JTrail KWheelbase LStandover MFrame reach NFrame stack Saddle rail height minimum Saddle rail height maximum
20″ kids’ 25.5 72.0° 13.5 70.0° 44.5 1.5 4.2 4.8 86.4 51.8 30.6 42.7 58.5 71.0


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