Marin San Quentin 20" Children's Bicycle 2025

We took our Matt Jones-inspired Marin San Quentin and shrunk it down to fit 20-inch wheels. It's the perfect bike for kids who are ready for their first real hardcore hardtail mountain bike.

The Marin San Quentin 20", just like the version for older kids, pushes the boundaries of mountain bike genres - doing all this with a huge dose of big air, speed and style.

Designed with input from freeride legend Matt Jones, the San Quentin takes the DNA of our dirt-jumping Alcatraz and transforms it into a versatile, hardcore hardtail that goes further and faster. The San Quentin 20" will make your little ripper feel like a grown-up mountain bike, built with a robust 2-series aluminum frame, 20" wheels, an SR Suntour XCM suspension fork, an 8-speed Shimano drivetrain, and kid-specific hydraulic disc brakes.