Giant ARX 20 (2025): a lightweight, high-quality kids’ bike built to inspire confidence and fun for riders aged 6–8 years (around 120–140cm tall). With its ALUXX-grade aluminium frame, Shimano 8-speed gearing and child-sized finishing kit, the ARX 20 delivers the perfect blend of performance, comfort, and control for growing riders. Jump to: What • How • Why • FAQ WHAT is the Giant ARX 20? The Giant ARX 20 (2025) is engineered specifically for younger riders. Lighter than most kids’ bikes in its class, it’s made from the same ALUXX-grade aluminium used in Giant’s adult performance bikes. The Shimano Altus 8-speed drivetrain and kid-sized contact points make it easy to handle, while durable tyres and alloy components ensure long-lasting fun and reliability. Wheel size: 20" Rider height: 120–140cm (approx. 6–8 years) Frame: ALUXX-grade aluminium Fork: ALUXX-grade aluminium Gears: 8-speed Shifters: Shimano Altus SL-M315 1x8 Crankset: Alloy, forged, 32t, 115mm Cassette: Shimano HG200, 12x32 Rear Derailleur: Shimano Altus RD-M310 Brakes: Alloy linear-pull Rims: Giant Kids 20" alloy Tyres: Innova IB-3010, 20x1.5" Saddle: Selle Royal Vivo Jr. Accessories: Bell, rear derailleur guard, chain guide HOW does it ride? The ARX 20 rides light, smooth, and stable — perfect for young riders developing confidence. The low standover height helps kids get on and off easily, and the wide gearing makes hills manageable. The forged crankset and narrow handlebar width are designed for smaller proportions, keeping control intuitive and comfortable. Lightweight and easy to handle thanks to the aluminium frame Child-specific geometry keeps balance and control simple Responsive braking from alloy linear-pull brakes WHY choose the Giant ARX 20? The ARX 20 (2025) is for parents who want their child to have a quality bike that rides like an adult model — just in a smaller size. It’s light, efficient, and built with premium parts, so kids can enjoy smoother rides and progress faster. From school runs to park trails, it’s the perfect first geared bike. Best for: Young riders ready to move up from single-speed bikes Not for: Rough mountain trails or heavy off-road riding Highlights: Lightweight alloy frame • Shimano 8-speed • Junior-sized finishing kit Sizing & Fit Find my size Use your child’s height to choose the correct ARX model size. 115–135 cm ARX 20 — perfect for ages 6–8, typically for riders 120–140cm tall. 135–150 cm ARX 24 — next size up for riders aged 8–10. These sizes are a guide — see our kids' bike size guide or ask our team for expert advice. Suitable for ages 6–8 years (height 120–140cm). View our size guide or get fitting help. Frequently Asked Questions FAQs about the Giant ARX 20 (2025) Is the ARX 20 lightweight? Yes — it’s made from Giant’s ALUXX-grade aluminium, making it one of the lightest kids’ bikes in its category. Does it come with gears? Yes — it features an 8-speed Shimano Altus drivetrain for easy shifting on hills and flats. Does it include stabilisers? No — the ARX range is for confident riders ready for a geared, pedal-only bike. Are pedals included? Yes — supplied with durable platform pedals and a bell. Need help choosing the right kids’ bike? Ask our family cycling experts. More like this: Shop Kids’ Bikes • Explore Giant Kids Range Assembly & Safety Check Every kids’ bike is fully built and safety-checked by Cytech-qualified mechanics. Choose Click & Collect for a ready-to-ride handover, or have it shipped partially assembled with tools included. Delivery / Click & Collect Fast UK delivery or FREE Click & Collect from any of our stores. See Delivery Info for details. Cycle to School & Finance Spread the cost with finance options (subject to status) or save through Cycle to Work schemes for family bikes. On occasion, without notice, manufacturers may change product design and/or specifications.
