CUBE STEREO 240 ONE KID'S MTB BIKE 2026 ACTIONTEAM

When the bug bites, it's only natural that the mini mountain biker in the family is going to want a bike to match their enthusiasm. 

The Stereo 240 ONE's Manitou J-Unit fork and Radium Expert rear shock – with kids'-specific tune – is the one they're going to want. With its 24in wheels and perfectly proportioned frame, it's every inch a real mountain bike scaled down to size. That's why we fitted the easy-to-use 1x9 gear system, and powerful Magura hydraulic brakes – so your little shredder is as safe and confident coming down the hill as they are going up.

Key Features

• Magura MT Thirty Hydraulic Disc Brakes: Reliable and powerful stopping power for safe, controlled riding in all weather.
• HPA Ultralight Aluminium Frame: Lightweight, strong, and sized specifically for young riders.
• 9 Shimano Gears: A wide-ranging gear setup for smooth and easy handling of varied terrains.

Full Specification

• Frame: HPA Ultralight, Advanced Hydroform, Triple Butted, ETC 4-Link, ISCG Mount, 120mm travel
• Fork: Manitou Machete J-Unit Air, Tapered, 15x110mm, 120mm
• Shock: SR Suntour Edge R 165x38mm
• Brakes: Magura MT Thirty, Front 4-Piston / Rear 2-Piston, Hydr. Disc Brake (160/180)
• Rear Derailleur: Shimano Cues RD-U4000-GS, 9-Speed
• Shifters: Shimano Cues SL-U4010- Rapidfire-Plus
• Crankset: Acid 32T, 127mm with Chainguard
• Cassette: Cube AR SLT, 30T, 130mm
• Chain: KMC xGlide
• Groupset: Shimano Cues
• Headset: VP Integrated 1 1/8", Bottom 1 1/2"
• Handlebars: SDG Components Slater JR, 660mm
• Stem: Cube Performance Stem SLX, 31.8mm
• Bar Grips: SDG Components Slater JR
• Wheels: Cube EX25, 32H, Disc, Tubeless Ready
• Front hubs: Cube Engineered By Newmen, 15mm, Boost, 6-Bolt
• Rear hub: Cube Aluminium
• Tyres: Schwalbe Hans Dampf, Addix Performance, Kevlar, 2.35
• Saddle: Cube Kid
• Seatpost: Cube Performance Post, 30.9mm
• Seat clamp: CUBE Varioclose, 31.8mm
• Pedals: Not supplied
• Weight: 12,4 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, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.

Bike and frame weights are based on pre-production painted frames at time of publication. Weights may vary in final production.

We offer several delivery options:

Store Collection: Pick up your order at our Salts Mill store, located at BD17 7EH.

Standard Delivery We partner with APC Euro-Tran for deliveries. Once your bike is dispatched, it typically arrives within 1 to 3 working days for Mainland UK. All bikes are fully built, checked, set up and then packed back down into a standard size bike box. Please note that electric bikes will be shipped in two boxes due to weight and size restrictions. We recommend our premium delivery service for electric bikes.

Premium Delivery We partner with DX's two-person delivery team. After dispatch, your bike usually arrives within 2 to 4 working days for Mainland UK. DX will contact you before delivery to schedule a convenient delivery date. All bikes come fully built, checked, set up and with both wheels attached. Trek bikes can only be sent via our premium delivery service.

Check out our video for more information on how your bike is assembled and packaged. 

At All Terrain Cycles, we want you to ride with confidence every time. To ensure your bike or e-bike stays in peak condition, here are some essential safety and maintenance tips.

Bicycle Safety 

Always wear a helmet – Safeguard against head injuries by using a properly fitted, safety-certified helmet.

Perform pre-ride checks – Before each ride, verify that brakes, tyres, and gears are in good working order.

Stay visible – Utilise lights and reflective gear when cycling in low-light conditions.

Follow road rules – Ride responsibly and remain aware of your surroundings.

Aftercare for Your New Bike Initial Check-Up (First 50-100 miles)

Gear Adjustment – New cables may stretch slightly; have a qualified mechanic check and adjust them.

Brake & Wheel Check – Inspect brakes for wear and ensure wheels are aligned properly.

Lubrication – Apply chain oil and check bolt tightness to maintain smooth performance.

Tyre Pressure – Regularly monitor to prevent flats and enhance efficiency.

Pedals - Ensure pedals are still tight and correctly fitted.

Routine Maintenance (Every Few Weeks)

Chain Care – Clean and lubricate your chain to minimise wear and prolong its life.

Brake Safety – Check brake pads and responsiveness before each ride.

Tyre Inspection – Look for punctures and ensure correct air pressure.

Handlebar & Stem Alignment – Confirm they are tight and secure to prevent instability.

Frame Safety Check – Look for any signs of damage or cracks.

Pedals - Ensure pedals are still tight and correctly fitted.

Professional Check-Ups

Have your bike serviced at least once a year, or more frequently if you ride often.

Aftercare for Your New Electric Bicycle (e-Bike) Initial Check-Up (First 50-100 miles)

Battery Care – Fully charge your battery (if required) before the first ride and store it in a dry, moderate-temperature environment.

Avoid Overcharging – Unplug the charger once fully charged to extend battery life.

Pedals - Ensure pedals are still tight and correctly fitted.

Routine e-Bike Maintenance (Every Few Weeks)

Motor Inspection – Listen for unusual noises and ensure smooth operation.

Battery & Connection Checks – Inspect cables and connectors for dirt, moisture, or damage.

Pedals - Ensure pedals are still tight and correctly fitted.

Seasonal e-Bike Maintenance

Check Electrical Components – Ensure wires and connections are clean and secure.

Professional Servicing – Have your e-bike inspected at least once a year or every 500-1000 miles for optimal performance.

By following these aftercare guidelines, you’ll help ensure that your bicycle runs smoothly, lasts longer, and remains a joy to ride. Stay safe and enjoy the ride!

Read our full advice

If you have any problems or concerns: Contact All Terrain Customer Services on 01274 588488 or email sales@allterraincycles.co.uk