BYK 540CX Kids Cyclocross Bike

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  • Regular price $669.00

Pure fun for the kid looking for a kids cyclocross bike. Dirt, road, trails, triathlon, touring & more. 

540CX Cyclocross Bike | Age: 7 - 11 years | Height: 130 - 160 cms

The ultimate kids cyclocross bike allows you to race around the cyclocross track like a pro, and ride to school the next day.

You can even still use it as a road bike as well. With predictive handling, shock absorbing geometry, premium Microshift 16 speed SRAM cassette gearing, and the highest safety and stopping power, this is a thoughtfully designed and impeccably safe kids road bike. Just 11kg.

Ability Level: Comfortable with major skills and ready for the next step. Looks to anticipate the twists, turns and bumps ahead.

ByK 540CX Kids Cyclocross Bike Features


At ByK we know kids love to be like their heroes, on the 540CX they can be ready to race around the cyclocross track like a pro and ride to school the next day. Our unique design makes it possible to ride on the roads smoothly as well dabble in triathlons or touring.

Our clever integrated child specific gear design combine with premium components for a lightweight, versatile and strong dream machine.

Like the entire ByK Range, this is not a scaled down adult bike. Every single component has been considered, tested, custom sized and tuned to suit our rider's profile. Our unique ergonomic riding position and geometry offer a range of riding positions and adjustability unexpected at this size.


Our newest bike is trail inspired but what really shines about the E-540CX is that it handles the vast variety of real world riding challenges like no other.

From our lightweight ergonomic Alloy frame and CRM forks to the durable wide, knobby race tyres with high puncture resistance and the custom sized handlebars and stem for the best possible control and comfort, every details has been considered.

Microshift's innovative gear/brake shifters are child specific, super easy to reach and use and we have combined them with our premium SRAM cassette, gear changing is taken to a new level for kids road bikes.


Safety is paramount for ByK and with the E540CX ByK takes safety to a new level for a kids bike. From our predictive handling and shock absorbing geometry to the coolest and great stopping power of our mini v-brake system. The innovative frame improves balance and control to help each rider operate at the safest level possible.

To make a children's bike safe, the rider needs to be able to brake efficiently and confidently. The custom-sized V-Brakes we have used are calibrated for age, ability and ergonomic fit. And they are made of non-flexing, strong and light alloy. Our light weight alloy rims ensure pedalling is easier. But more importantly alloy rims are a more efficient braking surface than cheaper, chrome-plated steel rims, and are therefore safer.

Little Details Count:

  • True cartridge bottom bracket for straighter chain alignment.
  • SRAM Cassette gears for maximum shift accuracy and reliability.
  • CRM Forks for extra comfort and improved handling.
  • Super tough alloy wheels for reduced maintenance.
  • Calibrated V-Brakes for progressive braking.
  • Full grip pedals for added safety.
  • Machined surface rms for predictable braking.
  • Custom sized grips.


  • Specificiations

    Weight: 11kg
    Minimum Seat Height: 72cm
    Frame : Butted Alloy Frame, Low Gravity Concept Design, CRM Forks
    Gears: 16 Speed Microshift Integrated Alloy Levers, Microshift Alloy R8 Rear Derailler, SRAM Mid Range Cassette and Front Derailler. Prowheel Alloy Cranks Custom Length
    Wheels: Dynamic Advantage Tall Alloy Wheels, Reinforced 36 Hole
    Tyres: Low Profile, Low Resistence Design with Micro grip & Tough Tubes
    Brakes: Tektro Power Control Alloy Mini V-Brakes
    Brake Levers: Max Power Alloy Tektro Custom Sized Levers
    Saddle: Adjustable, Comfort Midi+ Deluxe
    Handlebars: Alloy Custom Width, Drop & Reach with Alloy Short Reach Stem
    Safety Reflectors: Included
    Bells: Included


  • How to Choose the Right Size Kids Bike

    When it comes to choosing the right size kids bike, our over-riding advice is 'smaller is better than bigger'. Children learn to ride with greater ease, have more control on the bike and have a lot more fun if they are the master of their domain.

    Our overall advice on choosing the right size kids' bike is based not only on Age and Height, but Ability and Personal Confidence.  

    It is all too common to see parents using height as the only key measurement for a bike's correct size. Be careful: it can easily be misleading as an indicator. As most kids' balance develops at roughly the same speed, using age with ability is far more relevant. If you can add age, with height, and ability (ability is a hard one to measure but as a parent you must be honest and realistic) and confidence, than you have a really good indicator.

    A bike is the right size when your child can:

    • Sit on the saddle and rest the balls of both feet on the ground.
    • Straddle the top bar with a comfortable clearance and with both feet flat on the ground.
    • Reach the handlebars with a slight bend in the arms when sitting on the seat.
    • If there are handbrakes, your child should be able to grasp them and apply enough pressure to stop the bike. 

    The most common reason kids have to move up a size on a normal bike is because of the lack of knee room between the seat and handlebars. This forces you to put up the seat and then your child loses interest or confidence in riding because the centre of gravity is really high and hence the bike becomes even more difficult to ride.

    ByK bikes have more knee room than other bikes, which helps to lengthen the life of the bike and make the bike handle in a more predictable way.