Dartmoor Sparrow Junior 26/24 Junior Trail Frame

Do you want a safe, highly maneuverable, and extremely durable bike for your child to help take their riding skills to the next level? The Dartmoor Sparrow Junior for the 2026 model year represents the perfect bridge between kids' bikes and adult standards. This premium aluminum frame is designed specifically for young bikers with a height from 130 to 150 cm and is the ideal foundation for building a machine for trail, singletrack, pumping track laps, and technical bike park riding. Thanks to its smart construction and top-tier materials, it gives young riders the stability they need to build confidence in the terrain, while giving you as parents the peace of mind that you are investing in a highly safe and durable foundation.

Key Advantages of the Dartmoor Sparrow Junior Frame

• Geometry Designed for Kids: A lowered top tube (low standover) guarantees safe mounting, dismounting, and easy handling even in critical situations.
• Unique 26" and 24" Wheel Concept: The frame grows with your child – you can start on smaller 24" wheels and later easily upgrade to the adult 26" size without the need to buy a new frame.
• Extremely Durable AL 6061-T6 Aluminum: The heat-treated aluminum frame easily withstands crashes, hard landings, and challenging beginnings on the trails.
• Dropper Post Compatibility: The 30.9 mm seat tube diameter with internal routing allows the installation of a dropper post for safer descending on steep hills.
• Tapered Head Tube: The frame meets modern adult standards and allows the installation of high-quality suspension forks with a tapered steerer.

Premium AL 6061-T6 Aluminum: Safety and Durability First

When choosing a bike for a child, durability is key. Young riders love to push their limits, and crashes are an inherent part of learning. The Dartmoor Sparrow Junior frame is made of premium AL 6061-T6 aluminum alloy, which has undergone a special heat-treatment process. The result is a construction with an excellent ratio between low weight and extreme mechanical strength. The tubes are reinforced in the most stressed areas, preventing material fatigue or frame cracking during jumps. For you as parents, this means one thing – you are buying a frame that will safely protect your young biker, withstand years of hard treatment, and maintain a high resale value for later.

Playful and Safe Geometry for Fast Skill Building

Children do not just need a smaller version of an adult frame – they need a completely different geometry tailored to their body proportions and shorter limbs. The 2026 model line comes with a significantly lowered profile. The low top tube ensures that in the event of an unexpected stop or loss of balance, the child can safely and quickly step down with both feet on the ground without risking a painful impact against the frame. The short chainstay makes the bike incredibly agile. This makes it much easier for your child to learn basic technical skills such as lifting the front wheel, manualing, or smoothly riding berms on a pump track. Additionally, the well-designed head tube angle maintains traction and ensures **excellent stability at higher speeds**.

Smart "2-in-1" Concept: A Bike That Grows with Your Rider

Children grow at lightning speed, and buying a new bike every year is financially demanding. The Dartmoor Sparrow Junior solves this problem elegantly with its **adaptability for both 24" and 26" wheels**. If you have a smaller rider at home (around 130 cm), you can build the bike on agile 24" wheels with wider tires, making it easier for them to handle. Once they grow, you don't need to buy a new frame – just rebuild or swap the wheels for the larger 26" size. The frame also features a standard threaded BSA 73 mm bottom bracket, which does not suffer from annoying creaking and is easy to clean and service even at home. There is also integrated routing for internal dropper post cabling, which increases safety on difficult descents by one hundred percent.

Technical Specification

Parameter / Component	Value / Specification
Material	AL 6061-T6 (heat-treated aluminum alloy)
Recommended fork travel	100 mm – 120 mm
Compatible wheel size	26" (or 24" with appropriate setup)
Rear hub / axle	135 x 10 mm (classic quick release or bolt-on solid axle)
Headset	IS42 / IS52 (integrated, tapered steerer)
Bottom bracket	BSA / Euro 73 mm (threaded)
Seatpost diameter	30.9 mm (inner routing support for dropper post)
Seat clamp diameter	34.9 mm
Maximum tire clearance	26" x 2.4" (or 24" x 2.4")
Brake mount	IS (International Standard), max. rotor size 160 mm
Frame weight	approx. 2.15 kg

Frequently Asked Questions (FAQ)

What age and height is the Dartmoor Sparrow Junior frame suitable for?

This frame is geometrically optimized for young riders with a height from approximately 130 cm to 150 cm. Age in this case is only a guide (usually 8 to 12 years); the actual body height is key. Thanks to its versatility, allowing you to mount either smaller 24" wheelsets or full-sized 26" wheels, the frame can serve for many years and smoothly adapt to your child's growth.

What other components will I need to build the bike, and which ones can I purchase directly from you?

To build a complete, fully functional bike, you will need specific standardized parts to go with the frame. Crucial elements include the integrated tapered headset IS42/IS52 (the dust-proof Dartmoor Blink is an excellent choice) and a 34.9 mm seat clamp. If you want to give your child maximum safety and control over the bike during descents, we highly recommend equipping it with a teleskopickou sedlovkou (dropper post) with a 30.9 mm diameter and internal routing.