2021 Timberjack GX Eagle 29

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The all new Timberjack is proof that hardtails are evolving just as quickly as their full suspension siblings. We've brought a slew of updates to our aggressive trail hardtail that make it a pure joy to ride. The geometry is longer, lower, and slacker with a steeper seat tube for a little extra assurance when you're rolling down that rock face and clearing that root covered climb. More cargo mounting options allow you to ride without a pack, or load up and go bikepacking for the weekend. Adjustable Alternator 2.0 dropouts open up possibilities for ride tuning and drivetrain options. The 29 x 2.6" wheel and tire package maintains momentum and traction through the trail's tricky spots, and SRAM's GX Eagle group keeps you moving efficiently any time gravity stops working in your favor. The all new Timberjack: experience hardtail mountain bike evolution.


  • 6061-T6 Aluminum Tubing

    Timberjack is built from our proprietary, top-shelf 6061-T6 aluminum tubing, which is double- and triple-butted in the main triangle for a light, responsive, and durable frame with great trail feel.

  • Timberjack Geometry

    Our second-generation Timberjack geometry is longer, lower, and slacker for aggressive riding. A 66-degree head tube and long wheelbase make for a stable ride, while a long reach and steep (75-degree) seat tube balance weight distribution for efficient pedaling. Short chainstays (adjustable from 420-437 mm) keep the rear end nimble for responsive handling.

  • 130 mm Suspension Fork

    Soak up the harshness of gnarly roots, rock gardens, drops, or whatever's in your path with 130 mm of suspension travel up front. Timberjack accommodates forks with up to 150 mm of travel.

  • Adjustable TranzX dropper post

    Get your saddle out of the way for steep descents and technical sections with the included dropper post. 30 mm of tool-free travel adjustment lets you dial in the right travel for your fit and riding style.

  • Alternator 2.0 Dropouts

    Our adjustable Alternator dropout system lets you run Timberjack geared or single-speed and accommodates multiple hub standards. Built-in adjustability gives you 17 mm of wheelbase travel so you can dial in your preferred ride characteristics.

  • Bottle & Accessory Mounts

    SM-XL frames have two bottle mounts-including a Three-Pack mount on the downtube-in the main triangle (XS frames have only the Three-Pack mount on the downtube). All sizes feature an accessory mount on the underside of the down tube, plus top tube mounts for our EXP Series Direct Mount Top Tube Bag means room for more ride essentials. Rear rack mounts open up possibilities for larger loads.

  • Full-Length Internal Routing

    Full-length internal routing for brake lines and shift cable housing means more reliable performance in sloppy conditions, simplified maintenance, and a better fit for frame bags.

  • Wheel and Tire Options

    Timberjack is compatible with both 27.5 x 2.8" and 29 x 2.1-2.6" wheel and tire combinations.

    Build Kit

    Frame Timberjack v2 Aluminum
    Fork Marzocchi Bomber Z2 Air Sweep Adjust, 130 mm
    Color Teal
    Rear Shock N/A

    Front Der N/A
    Rear Der SRAM GX Eagle
    Cassette SRAM XG-1275 10-52t, 12-speed
    Chain SRAM NX Eagle
    Crankset TRUVATIV Descendant 6K Eagle, DUB, 32t
    Shifter SRAM GX Eagle
    Brakes & Rotors SRAM Guide T, SRAM CenterLine 6-bolt rotors (180 mm front and rear)

    Headset (Upper/Lower) FSA Orbit NO.57E 1.5 ZS
    Stem Salsa Guide Trail 35.0, 50 mm
    Handlebar Race Face Chester 35.0 mm, 780 mm width, 20 mm rise XS-SM; 35 mm Rise MD-XL
    Grips/Bar Tape Salsa File Tread
    Seatpost TranzX YSP05JL 30.9 mm, 0 mm offset, 30 mm Travel Adjustable, 125 x 409 mm XS-SM; 150 x 459 mm MD; 170 x 499 mm LG; 200 x 559 mm XL
    Saddle WTB Volt Medium, Steel, 142 x 265 mm

    Front Wheel WTB Speedterra 6-bolt 15 x 110 mm hub, WTB ST i30 32h 29" rim
    Rear Wheel WTB Speedterra XD 6-bolt 12 x 148 mm hub, WTB ST i30 32h 29" rim
    Tires Maxxis Minion DHF front, Maxxis Rekon rear, 29 x 2.6", EXO C3 TR

    Complete Bike Weight 29 lbs 8 oz for Medium

    Component Sizing

    Size XS SM MD LG XL
    Stem Length 50mm 50mm 50mm 50mm 50mm
    Crank Length 170mm 170mm 175mm 175mm 175mm
    Handlebar Width 780mm 780mm 780mm 780mm 780mm
    Seatpost Offset 0mm 0mm 0mm 0mm 0mm

    * Specification and pricing subject to change without notice
    Geometry Details

    Click for 2021 Timberjack GX Eagle 29

    Setup & Instructions

    Click for Alternator 2.0 Dropout Instructions

    Click for Timberjack V2 Custom Frame Bag Guide

    Click for ASTM Use Condition Chart (PDF)

Tire Size Range for 622/29 Wheels:
53-66 mm (2.1-2.6")"
Tire Size Range for 584/27.5 Wheels:
71 mm (2.8")"
Maximum Wheel/Tire Diameter:
760.5 mm (29.95)"
Minimum Wheel/Tire Diameter:
728 mm (28.6)"
Suspension Fork Length (Travel):
511-563 mm (100-150 mm travel)
Rigid Fork Length:
483-501 mm
Fork Offset:
42-51 mm
30.9 mm
Seat Collar:
35 mm
Dropper Compatible (Routing):
Yes (internal)
Front Derailleur Mount:
Bottom Bracket:
73 mm BSA
Crankset (Max Ring):
52 mm Boost chainline 1x only (34t)
Rear Brake (Rotor):
IS mount (180 mm max)
Rear Spacing:
148 mm
Rear Axle:
M12 x 180L | TP = 1.5 | TL = 20
Derailleur Hanger:
Alternator 2.0 Swing Plate
Water Bottle Mounts:
XS = 1 | SM-XL = 2
Rack Mounts:
Yes | uses Alternator 2.0 plates | requires Salsa Rack-Lock
Fender Mounts:
Accessory Mounts:
Yes | one pair
TopTube Mounts:
Yes | compatible with Salsa EXP Series Direct Mount Top Tube Bag
Downtube Accessory Mounts:
Yes | one pair