Give your young rider a taste of real mountain biking with the Marin San Quentin 20" 2026 Kids Mountain Bike. Designed with input from freeride legend Matt Jones, the San Quentin 20" brings the aggressive, fun-loving DNA of Marin's Alcatraz dirt jumper to a smaller, kid-friendly package.
Built for young riders who want to ride harder, faster and explore further, the San Quentin 20" features a strong Series 2 6061 aluminium frame, lightweight 20" wheels and a Manitou J Unit 80mm air suspension fork. The air-sprung fork offers adjustable rebound and greater adjustability, making it possible to tune the suspension more effectively for lighter riders.
Built Like a Grown-Up Mountain Bike
The Marin San Quentin 20" isn't a scaled-down toy bike. It's a genuine kids hardtail mountain bike, equipped with the features you'd expect from a serious adult MTB. The 1x8-speed MicroSHIFT Acolyte drivetrain uses a clutch-equipped rear derailleur to help keep the chain secure when riding over rough and technical terrain.
Stopping power comes from Tektro kid-specific hydraulic disc brakes, providing powerful, controlled braking with short-reach levers designed specifically for smaller hands. The wide 2.4" Delium Versatile tyres provide plenty of grip and stability on trails, while the tubeless-compatible Marin alloy rims give young riders the option to upgrade to a tubeless setup in the future.
The one-piece saddle and seatpost combination helps reduce the overall ride height and standover, making it easier for younger riders to get on and off the bike while maintaining a confident riding position.
Ready for Trail Adventures
Whether they're tackling local trails, learning new skills at the bike park or simply enjoying off-road adventures with the family, the Marin San Quentin 20" is designed to encourage young riders to develop their mountain biking skills.
With its 20" wheels, 80mm air suspension, hydraulic disc brakes, 8-speed gearing and trail-ready 2.4" tyres, this is a kids mountain bike designed to keep up as their confidence and abilities grow.
The Yellow/Orange colourway gives the San Quentin 20" a bold, standout look to match its capable trail performance.
At The Rolling Fix, our independent bicycle shop in Liverpool, we're passionate about helping riders of all ages find the right bike. If you're looking for a quality kids mountain bike in Liverpool, the Marin San Quentin 20" 2026 is built to give young riders the confidence and capability to take their riding further.
Key Features
- Series 2 6061 aluminium hardtail frame
- 20" wheels designed specifically for younger riders
- Manitou J Unit Sport 80mm air suspension fork
- Adjustable rebound for suspension tuning
- MicroSHIFT Acolyte 1x8-speed drivetrain
- Clutch-equipped rear derailleur for improved chain retention
- Tektro kid-specific hydraulic disc brakes
- Short-reach brake levers designed for smaller hands
- Delium Versatile 20" x 2.4" tyres
- Tubeless-compatible double-wall alloy rims
- One-piece saddle and seatpost for a lower ride height
- Kids-specific grips and pedals
- Designed with input from freeride legend Matt Jones
- Bold Yellow/Orange finish
Why Buy the Marin San Quentin 20" from The Rolling Fix?
The Rolling Fix is an independent bicycle shop based in Liverpool, offering a range of quality bikes for riders of all ages. The San Quentin 20" is an ideal choice for young riders who have outgrown basic kids' bikes and are ready for a more capable children's mountain bike that can handle genuine off-road riding.
Shop the Marin San Quentin 20" 2026 Kids Mountain Bike at The Rolling Fix and get your young rider ready for their next trail adventure.
Specification
Frame: Series 2 6061 Aluminum, 20” Wheels, Disc Specific, 27.2 Post and Dropper Compatible
Front Suspension Manitou Junit Sport, 20", 80mm Travel, Air Sprung, Adjustable Rebound, Tapered Steerer. 15x110mm Axle
Rims: Marin, Double Wall Alloy, 26mm Internal, Tubeless Compatible
Hub, Rear: Forged Aluminum, 32H, Disc Specific
Hub, Front: Forged Aluminum, 32H, Disc Specific
Tires: Delium Versatile, 20”x2.4”, Light Construction, Wire Bead
Derailleur, Rear: MicroSHIFT Acolyte, 8-Speed, Super Short Cage, Clutch
Shift Lever: MicroSHIFT Acolyte, Short-Reach, 8-Speed
Crankset: Forged Alloy, Narrow Wide 30T, 127mm
Chain: KMC Z8
Brake, Front: Tektro HD-J285 Kid's Specific Hydraulic Disc
Brake, Rear: Tektro HD-J285 Kid's Specific Hydraulic Disc
Brake Levers: Tektro Kid's Specific Short Reach Lever for Hydraulic Brake
Handlebar: Marin Riser, 31.8mm Clamp, 30mm Rise, 580mm Width, 19mm OD Grip Section
Stem: Marin Alloy, 40mm
Grip: Marin MTB, Small Diameter
Headset: FSA No. 57E
Seatpost: Integrated With Saddle
Saddle: Marin One-Piece Saddle/Post Combo, 27.2mm Alloy Post
Pedals: Kids Specific Nylon PedalAxle