We took our Matt Jones-inspired Marin San Quentin and shrunk it down to fit 20” wheels. It's the perfect bike for kids who are ready for their first proper, hardcore hardtail mountain bike.
The Marin San Quentin 20, just like the big kid’s version, shreds the boundaries of the mountain bike genres - doing it all with a huge splash of big air, speed and style.
Designed with the input of freeride legend Matt Jones, the San Quentin takes the DNA of our dirt-jumping Alcatraz and mutates it into a go-further and faster all-round, hardcore hardtail.
The Marin San Quentin 20 will feel just like a ‘grown up’ mountain bike to your little ripper, built with a stout Series 2 aluminum frame, 20” wheels, a fully adjustable kid specific Manitou J-Unit suspension fork, 8-speed Shimano drivetrain and kid’s specific hydraulic disc brakes.
Sunset Cycles offers the 2026 Marin San Quentin 20 kids' hardtail mountain bike in Yellow/Orange finish with up to 24 months 0% finance and free delivery.
| Frame | Series 2 6061 Aluminum, 20” Wheels, Disc Specific, 30.9 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 |
| Spokes | 14g Stainless Steel |
| Tires | Delium Versatile, 20”x2.4”, Light Construction, Wire Bead |
| Derailleur Rear | Shimano Altus |
| Shift Lever | Shimano Altus SL-M315, 8-Speed |
| Crankset | Forged Alloy, Narrow Wide 30T, 127mm |
| Bottom Bracket | Sealed Cartridge Bearings, Square Taper |
| Chain | KMC Z8 |
| Cassette | Shimano 8-speed, 11-32T |
| Brakes Front | Tektro HD-J285 Kid's Specific Hydraulic Disc |
| Brakes 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 |
| Grips | 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 Pedal |
| Frame Size | Rider Height Guidance* |
| One Size (20in wheel) | 3'8" to 4'4" |
| *This is for guidance only. You may be taller or shorter, it doesn't mean our bikes will not fit you. The best way to determine the correct bike size for you is to try one. Please contact us if you are in any doubt about the correct bike size for you. | |