San Quentin 20 2026

The supremely popular Marin San Quentin hardtail mountain bike, scaled down for young shredders, Just like the big kid’s version, the San Quentin 20 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 San Quentin 20” will feel just like a ‘grown up’ mountain bike to your little ripper, built with a stout Series 2 aluminium frame, 20” wheels, an Manitou suspension fork, 8-speed Shimano drivetrain and kid’s specific hydraulic disc brakes.

ONE SIZE - 3'8" to 4'4"

SPECIFICATION -

Frame - Series 2 6061 Aluminium, 20” Wheels, Disc Specific, 135mm Dropouts
Front Suspension - Manitou 20 Junit Sport Air BOOST, 80mm Travel, 110mm Axle Spacing
Rim - Marin, Double Wall Alloy, 25mm Internal
Hub Rear - Forged Aluminium, 32H, Disc Specific
Hub Front - Forged Aluminium, 32H, Disc Specific
Spokes - 14g Stainless Steel
Tires - Vee Tire Crown Gem, 20x2.6”, 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, 140mm
Bottom Bracket - Sealed Cartridge Bearings, Square Taper
Chain - KMC Z8
Cassette - MicroSHIFT Acolyte, 8-Speed, 11-38T
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, 31.8 clamp, 30mm Rise, 590mm Width
Stem - Marin Alloy, 35mm
Grips - Marin MTB
Headset - 1-1/8" x 1-1/8" FSA No 10P
Seatpost - Marin Alloy, 30.9mm
Saddle - Marin Kids MTB
Pedals - Kids Specific Nylon Pedal