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Precaliber 20 Girl's

$229.99 Model 21915
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Let their adventures begin

Trek Kids' mountain bikes are the real deal, with light frames, knobby tires, quality parts, durable construction, and Dialed adjustable components that can grow with young riders.

Adventurous kids deserve a true, trail-ready bike that will take them down the road or off the road with confidence and control.

Key features

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

More options


  • Frameset

    20˝ Dialed frame size, Alpha Silver Aluminum
    Dialed 20˝, high-tensile steel
  • Wheels

    Front Hub
    Rear Hub
    Coaster brake
    20˝ 32-hole alloy
    Bontrager Dialed 20x1.80˝
  • Drivetrain

    Dialed adjustable length 120mm - 140mm, 32T
    Bottom bracket
    Sealed cartridge
    19T cog
    Dialed 9/16˝, platform
  • Components

    Dialed 20˝ size, padded
    Steel, 27.2mm
    Dialed 20˝ size, 90mm rise
    Dialed, Kraton
    Dialed, alloy
    Adjustable ball bearing, threadless
    Alloy linear-pull w/Dialed alloy levers and coaster brake rear hub
  • Weight

    11.02 kg / 24.30 lbs
    Weight limit
    This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 80 pounds (36 kg).
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 off Trek pre-production painted frames at time of publication. Weights may vary in final production.

Sizing & fit

The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local Trek retailer.


Rider Height

All measurements provided in cm unless otherwise noted.

Wheel size A Seat tube B Seat tube angle C Head tube length D Head angle E Effective top tube G Bottom bracket drop I Offset J Trail K Wheelbase L Standover M Frame reach N Frame stack Saddle rail height minimum Saddle rail height maximum
20" kids' 25.5 72.0° 10.5 70.0° 44.5 1.5 4.2 4.8 87.3 46.9 30.6 42.9 59.0 73.5

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