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The Sunpeed Alpha 20" is a great first mountain bike for Darwin kids. Featuring hydraulic disc brakes, 7-speed Shimano gearing, and a lockable fork, it offers pro-level performance and safety in a lightweight package.
Small Size, Big Performance
The Sunpeed Alpha 20"
We know Darwin kids are active, so we’ve stocked a bike that can keep up. It’s light enough for them to handle with ease, yet tough enough for the dirt trails and tropical conditions of the Top End.
Alpha 20" comes equipped with III PRO Hydraulic Disc Brakes. Unlike traditional rim or mechanical brakes, these require very little hand strength to operate, giving young riders total confidence and control when stopping on hills or in wet weather.
Adventure-Ready Geometry
With its 6061-T6 Aluminium frame and lockable suspension fork, the Alpha 20" offers a smooth, stable ride. The 7-speed Shimano shifting is intuitive for kids learning to use gears, allowing them to climb hills without frustration. Plus, the fun "cat" graphics and vibrant colours—White, Orange, and Pink—make it a bike they’ll actually be excited to ride.
Key Features:
• Braking: Hydraulic disc brakes for effortless stopping power.
• Lightweight Build: Easy to maneuver and easy for parents to transport.
• Trail to Path: Lockable suspension for versatile riding surfaces.
• Kid-Friendly Shifting: Simple Shimano 7-speed drivetrain.
• Durable Design: High-quality alloy components built to last.
Technical Specifications
• Frame: Sunpeed Alpha 20" Aluminium 6061-T6
• Fork: 20" Alloy Suspension with Lockout
• Brakes: III PRO Hydraulic Disc Brakes (160mm rotors)
• Shifter: Shimano SL-RV200 7-Speed
• Rear Derailleur: Shimano TZ500 7-Speed
• Crankset: Wheeltop SPD4H 1x System
• Cassette: ATA 14-28T 7-Speed
• Tyres: Kenda 20" x 1.95" All-terrain
• Handlebars: ANV 31.8mm x 560mm
• Weight: 12.7kg
| Wheel size | Rider height (approx.) | Age (approx.) | Inseam (approx.) |
|---|---|---|---|
| Alpha 20" | 117–135 cm | 5–8 years | 56–64 cm |
| Alpha 24" | 135–145 cm | 7–11 years | 61–71 cm |
| Alpha 26" | 137 cm and up | 10+ years | 66 cm and up |
This is a general kids' bike sizing guide, not Sunpeed's own figures. Kids grow at different rates, so use it as a starting point.
Sunpeed's official standover height (the frame height where your child stands over the bike): 476 mm on the Alpha 20" and 606 mm on the Alpha 24".
Not sure? Bring them in. Pop into Blue Cycles at 12 Totem Road, Coconut Grove and we'll do a free fit check so your child gets the right size first time.