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Specialized Jett 20" Single Speed Kids Bike

Specialized Jett 20" Single Speed Kids Bike

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Regular price $249.99
Regular price $425.00 Sale price $249.99
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One Size 3'11" to 4'7"


Shipped Direct to Your Home

Our Platinum Pro Assembly fee of only $75 will be added at checkout. Your Specialized kids bike will be built, fine-tuned and expertly packaged by our certified team of bike techs. Your new bike comes 90% built, reassembly is quick and easy with our video guides. Your new bike ships within 3-5 business days.

Pick Up at Bicycle Warehouse

$25 Ready to Ride

Bikes comes 100% built and ready to ride. This fee includes professional assembly & setup, one basic Master Service and free warranty processing. Shipped bikes are not charged this fee.

Bicycle Warehosue now offers optional Route Package Protection. Route Package Protection offers peace of mind for your shipments by providing shipping insurance. This coverage ensures that if your package is lost in transit, stolen, or damaged, you're protected. For a small percentage of the total value of your order, Route will promptly generate a replacement order or issue a refund if you no longer want the items.


At Bicycle Warehouse your satisfaction is our top priority. We understand the importance of your happiness with every purchase, which is why we proudly offer our 30 Day Love It Guarantee for your unused gear and 14 days on all bikes. Our exchange and returns process is quick and easy.

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Get your dream bike today with FREE financing (12 months same as cash, on approved credit). For more information visit our financing page and get approved.

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Introducing the Specialized Jett 20" Single Speed Kids Bike—a ride that's all about expertly FUN growth and unstoppable adventure! Kids are like shooting stars, zipping through childhood and sprouting up in the blink of an eye. Finding the perfect bike fit during these cosmic growth spurts can feel like catching stardust, but fear not, Specialized cracked the code.

The Jett is the magic carpet ride that keeps up with your young explorer's stellar journey. Specialized cracked open the growth playbook and discovered the secret formula: arms and legs on turbo speed, while the torso plays catch-up. Armed with this cosmic knowledge, they crafted a bike that's a constellation of comfort, built to withstand every growth spurt with cosmic style.

Picture this: the Jett is like a cosmic chameleon, shape-shifting as your little astronaut grows. The handlebars, the cockpit of cosmic control, are fully adjustable to match arm length as they reach for the stars. The top-notch researchers studied the galaxies of kids' ergonomics and created a saddle and grips that fit like custom-made comet handles, complete with handbrakes for pint-sized planetary navigation.

Specialized has engineered every nut, bolt, and beam to make the Jett one of the lightest bikes out there. It's a ride that's practically weightless, inviting your young cosmonaut to pedal through the Milky Way with ease. Don't be surprised if they refuse to touch down—the Jett's gravitational pull is just too strong.

So, if you're ready to launch the next generation of interstellar explorers, look no further than the Specialized Jett 20" Single Speed Kids Bike. It's not just a bike; it's a rocket-fueled journey of growth, FUN, and cosmic connection. Get ready to set them on a trajectory of boundless excitement—because with the Jett, they'll be reaching for the stars and soaring beyond!


  • Specialized designed the Jett Single Speed to be uniquely adjustable with longer seatposts and adjustable handlebars so kids can dial-in the perfect riding position as they grow.
  • Every detail of the Jett Single Speed—including the 130mm Bridge saddle, narrower-diameter grips, and short-reach, tool-less adjustable brake levers—was informed by Retül data from a kids’ research group to be perfectly proportional for young riders.
  • A lightweight bike is simply more fun and the Jett Single Speed’s all-new A1 aluminum frame, alloy fork, Pathfinder tires, and single-speed drivetrain make it one of the lightest kids’ bikes on the market.



18t Freewheel




Forged Alloy, Square Taper, Single Speed, w/ Chainguard


KMC Z1 EPT (Anti-Rust)

Bottom Bracket

Square taper, Plastic cups, 113mm spindle


3D Forged Aluminum, 35mm length, 6 degree rise, 25.4mm clamp diameter


Alloy Mini Rise, Double Butted, 60mm Rise, 5-degree Backsweep, 580mm Width, 25.4mm Clamp Diameter, 19mm Bar End Diameter


Alloy, 2-bolt, 14mm offset, 27.2mm


Jett Body Geometry, 19mm Internal Diameter, lock-on


Kids Bridge Saddle, 130mm


A1 Premium Butted Alloy, Alloy steerer, V-Brake


A1 Premium Butted Alloy, unisex frame, internal cable routing, 110x10mm dropouts

Seat Binder

Bolt-type, 31.8mm


Alloy, 14mm Depth, 23mm Internal Width, 28H

Front Hub

Alloy, Loose Ball Bearings, Bolt type, 100mm Spacing, 28H

Rear Hub

Alloy, Loose Ball Bearings, Bolt type, 110mm Spacing, 28H

Front Tire

Pathfinder Sport, 20x2.0"

Rear Tire

Pathfinder Sport, 20x2.0"

Inner Tubes

Schrader valve


Stainless, 14g


Nylon platform w/ reflectors

Rear Brake

V-brake w/ tool-less reach adjust brake lever

Front Brake

V-brake w/ tool-less reach adjust brake lever


Stack 398mm
Reach 295mm
Head-Tube Length 100mm
Head-Tube Angle 69°
B-B Height 229.5mm
B-B Drop 30mm
Trail 57mm
Fork Length (full) 305mm
Fork Rake/Offset 40mm
Front-Center 480mm
Chain-Stay Length 350mm
Wheelbase 828mm
Top-Tube Length (horizontal) 417mm
Bike Stand-Over Height 510mm
Seat-Tube Length 290mm
Seat-Tube Angle 73°