Marin Bikes | San Quentin 3 29 Frame

Dirt-jump attitude built to charge the trails.

The Marin San Quentin 3 Frame is an aggressive 29er enduro hardtail platform built for riders who charge technical descents, jumps, and rough terrain.

Developed with freeride legend Matt Jones, the San Quentin combines the playful DNA of Marin’s Alcatraz dirt-jump bike with aggressive enduro-ready geometry and the rollover capability of 29-inch wheels. Its Series 3 aluminum construction creates a strong, responsive foundation for a hard-hitting custom build without the complexity of rear suspension.

Key Features

• Aggressive Enduro Geometry
A slack 64-degree head tube angle and steep 77-degree seat tube angle balance descending confidence with an efficient climbing position.

• Series 3 Aluminum Frame
Double-butted 6061 aluminum delivers a strong, lightweight, and responsive chassis.

• 29-Inch Wheel Platform
Designed around 29-inch wheels for greater momentum, stability, and rollover performance on rough terrain.

• Modern Build Compatibility
Features Boost rear spacing, a threaded bottom bracket, internal cable routing, and dedicated internal dropper-post routing.

Technical Specifications

• Category
Enduro Hardtail MTB Frame

• Discipline
Enduro / All-Mountain / Freeride

• Wheel Size
29 inches

• Frame Size
Small / 13 inches

• Construction / Material
Series 3 6061 Double-Butted Aluminum

• Recommended Fork Travel
140 mm

• Rear Axle
12 x 148 mm Boost Thru-Axle

• Bottom Bracket
73 mm Threaded

• Seatpost Diameter
30.9 mm

• Cable Routing
Internal Cable and Dropper-Post Routing

• Brake Compatibility
Disc Brake