Marin Bikes | 2025 San Quentin 3

📏Size Guide

Aggressive hardtail geometry meets upgraded trail components for riders who want speed, control, and confidence on demanding terrain.

The Marin San Quentin 3 29 is a high-performance aggressive hardtail built for technical trail riding, enduro-inspired descending, jumps, and bike park sessions. Designed around Marin’s Series 3 aluminum frame and modern long-low-slack geometry, the San Quentin 3 delivers the direct ride feel hardtail riders love while adding upgraded suspension, stronger braking performance, and refined trail components.

Equipped with a Marzocchi Bomber Z2 air fork, Shimano Deore 12-speed drivetrain, powerful TRP Slate EVO four-piston brakes, and Maxxis Assegai tires, the San Quentin 3 is built to attack steep descents, technical sections, and fast trail riding with confidence.

Key Features

• Series 3 Double-Butted Aluminum Frame
Modern aggressive hardtail frame with internal cable routing, boost spacing, and threaded bottom bracket design.

• Marzocchi Bomber Z2 Air Fork
140mm trail fork with air spring tuning and improved damping performance for aggressive riding.

• 29” Wheel Platform
Large wheels improve rollover capability, traction, and high-speed stability on technical terrain.

• Shimano Deore 1x12-Speed Drivetrain
Wide-range gearing with reliable shifting performance for steep climbs and fast descents.

• TRP Slate EVO 4-Piston Hydraulic Brakes
Powerful braking performance with excellent modulation and large 203mm rotors for aggressive trail use.

• Long-Travel TranzX Dropper Post
Allows fast saddle height adjustment for technical descents and varied terrain.

• Maxxis Assegai Tires
Aggressive trail tire setup delivers excellent grip and control on loose, rocky, and technical surfaces.

Technical Specifications

• Category
Enduro MTB Hardtail

• Discipline
MTB

• Frame
Series 3 6061 Aluminum, Double Butted, Internal Cable Routing, 12x148mm Thru-Axle

• Fork
Marzocchi Bomber Z2, 140mm Travel, Air Spring

• Bottom Bracket
FSA MegaExo 73mm BSA

• Headset
FSA No 57E Semi-Sealed Cartridge Bearings

• Rear Derailleur
Shimano Deore 12-Speed SGS

• Front Derailleur
N/A

• Shifters
Shimano Deore SL-6100IR 12-Speed

• Crankset
FSA Comet Modular 1x, 32T Direct Mount Chainring

• Cassette
SunRace 12-Speed, MicroSpline, 10-51T

• Chain
KMC X-12 Silver and Black

• Brakes
TRP Slate EVO 4-Piston Hydraulic Disc Brakes

• Brake Rotors
203mm

• Wheelset
Marin Aluminum Double Wall, 29mm Inner Width, Tubeless Compatible

• Front Hub
Shimano HF-MT410B, 110x15mm, 32H

• Rear Hub
Shimano HB-MT410B, 148x12mm, MicroSpline Freehub

• Tires
Maxxis Assegai 29 x 2.5" MAXX TERRA EXO

• Handlebar
Marin Mini-Riser Alloy, 780mm Width

• Stem
Marin 3D Forged Alloy, 35mm

• Seatpost
TranzX YSP23JL Dropper Post

• Saddle
Marin Speed Concept

• Pedals
Marin Nylon Flat

• Color Options
Gloss White / Black / Red (#F5F5F5)

Geometry

Suitable for aggressive trail riding, enduro-inspired MTB terrain, technical descents, jump lines, and bike park riding.