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2018

Precaliber 24 21-speed Boy's

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$379.99 Model 21907
With Precaliber 24 21-speed Boy's, your youngster will feel unstoppable. Fast, high-quality components like a Shimano 21-speed drivetrain and a performance suspension fork will have them dreaming of the podium whether they're riding the trails, racing home from school, or shredding singletrack with the family. For kids ages 8-12, between 51-59˝ tall.
With Precaliber 24 21-speed Boy's, your youngster will feel unstoppable. Fast, high-quality components like a Shimano 21-speed drivetrain and a performance suspension fork will have them dreaming of the podium whether they're riding the trails, racing home from school, or shredding singletrack with the family. For kids ages 8-12, between 51-59˝ tall.
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It's right for you if...

Your kid already has big riding aspirations. They want to get into mountain biking, and want to lead family rides on a bike with efficient components like a front suspension fork and a wide range of gearing.

The tech you get

A lightweight aluminum frame, a 21-speed drivetrain, grippy Bontrager tires on 24˝ wheels, and a front suspension fork with 45mm of travel to absorb bumps on the road, path, or trail. Plus, it has parts designed specifically for kids, like a saddle, grips, pedals, and a Dialed adjustable crank that lets this bike keep up with growth spurts.

The final word

With a strong frame to stand up to tough trails, a 21-speed drivetrain to power up hills, and a front suspension fork to smooth out the ride, this bike has everything your young rider needs to be a cycling superstar. 

favorite_borderWhy you'll love it

  1. The wide range of gearing makes it easier for younger riders to keep up with the pack, so you can go on longer and faster rides as a family
  2. We all know kids grow up fast, and our adjustable Dialed Fit system allows this bike to grow with them
  3. This bike can get your youngster hooked on a lifetime hobby that's healthy, environmentally friendly, and fun

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Features

Specifications

  • Frameset

    Frame
    24˝ Dialed frame size, Alpha Silver Aluminum
    Front suspension
    Dialed suspension, 45mm travel
  • Wheels

    Front hub
    Alloy
    Rear hub
    Alloy
    Rims
    24˝ 32-hole alloy
    Tires
    Bontrager XR1, 24x1.85˝
  • Drivetrain

    Shifters
    Shimano Tourney, 7 speed twist
    Front derailleur
    Shimano Tourney TY300
    Rear derailleur
    Shimano Tourney TY300
    Crank
    Dialed adjustable length 127mm - 152mm, 42/34/24
    Bottom bracket
    Loose ball
    Cassette
    14-28, 7 speed, freewheel
    Chain
    KMC Z50
    Pedals
    Dialed 9/16˝, platform
  • Components

    Saddle
    Dialed 24˝ size, padded
    Seatpost
    Steel, 27.2mm
    Handlebar
    Bontrager alloy, 25.4mm, 25mm rise
    Grips
    Dialed, Kraton
    Stem
    Bontrager alloy, 25.4mm, 15 degree
    Headset
    Adjustable ball bearing, threadless
    Brakeset
    Alloy linear-pull, Dialed alloy levers
  • Weight

    Weight
    12.43 kg / 27.40 lbs
    Weight limit
    This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 170 pounds (77 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
24" kids' 29.0 72.0° 10.5 70.0° 52.9 3.8 4.5 6.1 98.9 61.2 48.7 37.1 64.0 80.5

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