Giant Bikes Fathom 2

Get your dose of singletrack on a fun hardtail that puts you in control. The combination of a lightweight hardtail frame, 130mm suspension fork and 27.5 wheels with wide rims and high-volume tires delivers loads of traction, speed and fun on the trail.

With its updated ALUXX SL aluminum frame, quick-handling 27.5 wheels and high-volume tires, Fathom is a great choice for technical terrain and singletrack shredding. It blends the efficient ride quality of a classic hardtail with the confident ride quality of larger tires that absorb bumps and give you more traction—so you can tackle rougher trails with total control. The frame is designed with trail-friendly geometry that includes a more relaxed head angle and a 130mm suspension fork.

Key Performance Factors

Trail Tuned Design

Balanced geometry with a 75-degree seattube angle puts the rider in a powerful pedaling position on the climbs, while a slacker 66-degree head angle boosts confidence and control on technical descents.ALUXX SL aluminum frameset is hand-built in-house by the world leader in aluminum engineering.

Responsive Handling

Lightweight ALUXX SL aluminum hardtail frame offers agile acceleration and maneuverability to help riders climb, corner and hammer the flats with efficiency and speed.

Smooth Control

Giant Crest 34 suspension fork with 130mm of travel absorbs roots, rocks and ruts. Grippy, high-volume tires boost traction on rugged terrain. And a dropper seatpost with handlebar remote lets you adjust saddle height on the fly for confident positioning on changing terrain.


Built on a lightweight ALUXX SL aluminum frameset with progressive trail geometry, this hardtail features 27.5-inch wheels with grippy, high-volume 2.6-inch tires. It has a number of trail-specific features including a 130mm suspension fork and dropper seatpost. Here’s a look at Fathom’s key technologies:

Fathom with interactive tooltips

Aluxx SL Aluminum

This state-of-the-art aluminum material is made predominantly from 6011 alloy and delivers best-in-class strength-to-weight ratios. The frameset features unique welding technologies for a high-performance ride quality.


Crest 34 Suspenion Fork

130mm travel fork is engineered with a lightweight twin air spring along with volume spacers to adjust performance for riding style and weight. State-of-the-art machining provides tight tolerances for low-friction fork action, and an adjustable damper system lets riders fine-tune the feel.


Internal Cable Routing

Derailleur, brake and dropper post cables are primarily routed internally integrated ports. This helps saves weight and creates a cleaner look and performance.


Contact Switch Dropper Post

Durable and hassle-free dropper post uses alloy air and oil cartridge for smooth, consistent saddle height adjustment (125mm for Small, 150mm for Medium, 170mm for Large and XL). Handlebar-mounted remote lever makes it easy to operate on the fly.


Forged Chainstay

New frame design provides maximum rear tire clearance for larger tire sizes. This design also results in a shorter rear-center frame measurement for progressive trail riding performance.


27.5 Wheels

Added frame and fork clearance allows for 27.5-inch diameter wheels with wide rims and grippy, high-volume 2.6-inch tires. This wheel setup offers the perfect blend of agility and control for more technical terrain.


Additional Bottle Mount

Bottle mounts on the underside of the downtube allow Medium, Large and XL frames to carry three bottles. Small frames can carry two bottles (one on top side of downtube and one below).


1X Drivetrain Setup

Frameset is designed specifically for a single chainring crankset, further maximizing clearance for high-volume rear tire.


Boost Technology

Wider hub spacing (110mm front/148mm rear) results in stiffer wheels for added control plus more tire clearance and an improved chainline for optimal drivetrain performance.


Giant Tubeless System

Integrated Tubeless WheelSystem and tires deliver improved efficiency, comfort and control in the most user-friendly and reliable system.

Techs & Features

Sizing Guide and Geometry

Sizing to be used as a reference only. Please check with a local authorized Liv or Giant dealer to determine the correct size.
Available sizes may vary from country to country.

Selection of a button will change the units measurement displayed throughout the entire sizing guide section.
  • S
      5’4” to 5’8”
  • M
      5’7” to 5’11”
  • L
      5’10” to 6’2”
  • XL
      6’2” to 6’6”
bike diagram with measurements referenced in table that follows

Selection of a button will change the units measurement displayed throughout the entire sizing guide section.
    S M L XL
A Seat Tube Length (inch) 15 16.9 18.3 19.5
B Seat Tube Angle 75.0° 75.0° 75.0° 75.0°
C Top Tube Length (inch) 23.3 24.1 25.2 26.1
D Head Tube Length (inch) 3.7 3.7 4.1 4.5
E Head Tube Angle 66.0° 66.0° 66.0° 66.0°
F Fork Rake (inch) 1.7 1.7 1.7 1.7
G Trail (inch) 4.4 4.4 4.4 4.4
H Wheelbase (inch) 45.4 46.2 47.4 48.3
I Chain Stay Length (inch) 17.1 17.1 17.1 17.1
J Bottom Bracket Drop (inch) 2.4 2.4 2.4 2.4
K Stack (inch) 24.5 24.5 24.8 25.2
L Reach (inch) 16.7 17.5 18.5 19.3
M Stand Over Height (inch) 28 28.6 29.4 30.4
N Handlebar Width (inch) 30.7 30.7 30.7 30.7
O Stem Length (inch) 1.6 1.6 2 2
P Crank Length (inch) 6.5 6.7 6.7 6.7
Q Wheel Size 27.5" 27.5" 27.5" 27.5"
  • Sizes
    S, M, L, XL
  • Colors
    Black/Rosewood, Concrete
  • Frame
    ALUXX SL-Grade Aluminum
  • Fork
    Giant Crest 34 RCL, 130mm, Boost 15x110
  • Shock
  • Handlebar
    Giant Contact Trail, 35
  • Stem
    Giant Contact TR 35
  • Seatpost
    Giant Contact Switch dropper post with remote, 30.9
  • Saddle
    Giant Romero
  • Pedals
  • Shifters
    Shimano Deore
  • Front Derailleur
  • Rear Derailleur
    Shimano Deore, Shadow+
  • Brakes
    Tektro TKD143 [F&R] 2-Piston, 180mm Rotors [F&R]
  • Brake Levers
    Tektro TKD143
  • Cassette
    Shimano Deore, 12-speed, 10x51
  • Chain
  • Crankset
    Praxis Cadet Boost, 30t
  • Bottom Bracket
    Praxis, press fit
  • Rims
    Giant AM 27.5 wheelset, alloy, 30mm inner
  • Hubs
    Shimano Boost [F] 15x110 [R] 12x148, sealed bearing
  • Spokes
  • Tires
    Maxxis Ardent Race, tubeless, 27.5x2.6, foldable, TR
  • Extras
    Tubeless prepared
  • Weight
    The most accurate way to determine any bike’s weight is to have your local dealer weigh it for you. Many brands strive to list the lowest possible weight, but in reality weight can vary based on size, finish, hardware and accessories. All our bikes are designed for best-in-class weight and ride quality.