Giant STP Youth Mountain Bike
Giant STP: The All-Terrain Youth Mountain Bike
The Giant STP (Street Trail Performance) is the youth bike built for riders who want to ride everything — pump tracks, street, light jumps, and trail — on a single platform.
Available in 20", 24", and 26" wheel sizes, the STP range covers young riders from their first proper mountain bike through to the years before they step up to an adult frame. Each size shares the same low standover geometry and ALUXX aluminium construction, keeping the weight down without the cost of carbon. The whole package is built to be durable enough for everyday riding whatever the terrain.
Explore the full range of Giant Kids Bikes at Sprockets Cycles, Kilmarnock.
20" full-suspension kids mountain bike — the entry point to the STP range for younger riders tackling pump tracks and light trails.
A do-it-all youth mountain bike for pump tracks, jumps, streets, and light trail — agile, durable, and fun.
26" wheel STP for older youth riders — built for dirt jumps, streets, and progressive riding as skills develop.
- ALUXX Aluminium Frame: Lightweight in-house aluminium construction that keeps the STP manageable for smaller riders without sacrificing durability.
- Low Standover Height: Youth-specific geometry that makes mounting and dismounting easier and instils confidence for riders still developing their skills.
- Short-Reach Brake Levers: Sized for smaller hands so young riders can apply full braking force without overextending their fingers.
- Three Wheel Sizes: 20", 24", and 26" options cover young riders from first mountain bike through to the step up to an adult frame.
£1,499.00 / Giant STP 26 Dirt Jump Bike 2026
Street. Trail. Performance.
The Giant STP name reflects its design brief: a youth mountain bike that performs as well on a tarmac pump track as it does on a dirt trail. Unlike a dedicated cross-country hardtail, the STP's geometry is relaxed and playful, encouraging young riders to explore different terrain types and develop bike-handling skills across a variety of surfaces.
The STP range spans 20", 24", and 26" wheel sizes, covering young riders from approximately 5 years old through to the step up to an adult frame. Each size uses the same youth-specific component proportions — short-reach brake levers, smaller saddles, narrower cranks, and grips sized for smaller hands — making the STP a bike that genuinely fits rather than one that has to be grown into.
For riders ready to step up to full suspension and more technical trail capability, the Giant Faith is the natural progression. Visit Sprockets Cycles, Kilmarnock in store or call 01563 526800 for sizing advice.
FAQs
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What age is the Giant STP 24 designed for?
The STP range covers three wheel sizes: the 20" suits riders aged approximately 5 to 8; the 24" suits those aged 8 to 12 (roughly 120cm to 145cm in height); the 26" suits older riders from around 12 upwards. Sprockets Cycles recommends bringing your child in store for a proper fit rather than sizing purely by age, as body proportions vary considerably at this stage.
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Is the Giant STP a hardtail or full suspension?
The Giant STP is a hardtail — it has front suspension from a short-travel fork but no rear suspension. This keeps the weight low and the bike responsive on pump tracks and streets, where a fully rigid setup is typically preferred. If your child is ready for full suspension and more technical trail riding, the Giant Faith is the step up to consider.
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What is the difference between the Giant STP and the Giant XTC Jr?
The Giant XTC Jr is a cross-country hardtail with geometry optimised for trail riding efficiency — it climbs well and handles smoothly on singletrack. The STP (Street Trail Performance) has a more relaxed, playful geometry designed for a mix of street, pump track, and light trail use. The STP prioritises fun and versatility across surfaces; the XTC Jr prioritises trail riding performance.
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Can the Giant STP be used on proper mountain bike trails?
Yes — the Giant STP handles blue-grade and easier red-grade mountain bike trails comfortably. The short-travel fork takes the edge off rooted and rocky sections, and the wide-range gearing manages the climbs typical of Scottish trail centres. It is not designed for the same level of technical terrain as a full-suspension bike like the Giant Faith, but for most family trail centre riding it is more than capable.