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 tyres delivers loads of traction, speed and fun on the trail.
With its updated ALUXX SL aluminium frame, quick-handling 27.5 wheels and high-volume tyres, 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 tyres 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
ALUXX SL aluminium frameset is hand-built in-house by the world leader in aluminium engineering.
Frame geometry is designed to optimise the confident, stable handling of plush high volume tyres (27.5x2.6), and is ideal for rugged, adventurous terrain.
More relaxed frame geometry (compared to XC) and control-focused components deliver added control for trail riding conditions.
S, M, L, XL
ALUXX SL-Grade Aluminium
Giant Crest 34 RCL, 130mm, 44mm offset
Giant Contact TR, 780x35mm
Giant Contact TR 35
Giant Contact Switch dropper post with remote, 30.9
SRAM SX Eagle
SRAM NX Eagle
SRAM SX Eagle, 11x50
SRAM SX Eagle
SRAM SX Eagle, 30t
SRAM DUB, press fit
Giant AM 27.5, tubeless ready, sleeve-joint rim, 30mm inner width
Giant Tracker Performance Boost thru axle
Maxxis Ardent Race 27.5x2.6, folding, TR
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.
Every effort has been made to ensure accuracy throughout this website. However, Giant reserves the right to change bike specifications, features, prices and colours without prior notice.
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:
Aluxx SL Aluminium
This state-of-the-art aluminium 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.
New frame design provides maximum rear tyre clearance for larger tyre sizes. This design also results in a shorter rear-centre frame measurement for progressive trail riding performance.
Added frame and fork clearance allows for 27.5-inch diameter wheels with wide rims and grippy, high-volume 2.6-inch tyres. 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 maximising clearance for high-volume rear tyre.
Wider hub spacing (110mm front/148mm rear) results in stiffer wheels for added control plus more tyre clearance and an improved chainline for optimal drivetrain performance.
Giant Tubeless System
Integrated Tubeless WheelSystem and tyres deliver improved efficiency, comfort and control in the most user-friendly and reliable system.
Selection of a button will change the units measurement displayed throughout the entire sizing guide section.
Seat Tube Length (mm)(inch)
Seat Tube Angle (degrees)
Top Tube Length (mm)(inch)
Head Tube Length (mm)(inch)
Head Tube Angle (degrees)
Fork Rake (mm)(inch)
Chain Stay Length (mm)(inch)
Bottom Bracket Drop (mm)(inch)
Stand Over Height (mm)(inch)
Handlebar Width (mm)(inch)
Stem Length (mm)(inch)
Crank Length (mm)(inch)
Technologies & Features
ALUXX SL Aluminum Technology
This High-Performance level, state-of-the-art aluminum material is made predominantly from 6011 alloy and delivers best-in-class strength-to-weight ratios. These framesets also feature unique welding technologies for a high-performance ride quality.
Giant’s original oversized fork steerer tube technology. Designed to provide precise front-end steering performance, the system’s oversized headset bearings (1 1/4” lower and 1 1/8” upper for road, 1 1/2” lower and 1 1/8” upper for mountain) and tapered steerer tube work in conjunction to provide optimal steering stiffness.
Fewer flat tires. Greater traction. Less rolling resistance and a smoother, faster ride. Giant’s Tubeless System makes it easier than ever to experience all these benefits.