Giant Fathom 1 29 (2020) Mountain Bike

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Built on an ALUXX SL aluminium frame, Fathom 29 features updated geometry that produces a stable ride quality for challenging XC trails. The frame is optimized for a 100mm suspension fork giving you efficiency on the climbs and total control on the descents. The Giant WheelSystem comes with tubeless tires already set up, making it easy to experience added efficiency and control, plus a reduced risk of flats on technical terrain.

Key Performance Factors

Proven alloy performance

ALUXX SL aluminium frameset is hand-built in-house by the world leader in aluminum engineering.

Balance and stability

Frame geometry is designed to optimize the balance and roll-over capabilities of 29-inch wheels.

XC control

Suspension fork offers 100mm of smooth travel for added XC control.


Sizes S, M, L, XL
Colors Metallic Navy
Frame ALUXX SL grade aluminium
Fork RockShox Recon RL Solo Air, 100mm travel
Shock N/A
Handlebar Giant Connect trail rise, 31.8mm
Stem Giant Contact, 8 degree
Seatpost Giant Contact Switch Dropper, 30.9mm
Saddle Giant Contact, Neutral
Pedals N/A
Shifters SRAM SX Eagle, 12sp
Front Derailleur N/A
Rear Derailleur SRAM NX Eagle
Brakes Shimano MT401 hydraulic disc, Fr:180mm, Rr:160mm
Brake Levers Shimano MT400 hydraulic
Cassette SRAM SX Eagle, 11-50T, 12sp
Chain SRAM SX Eagle
Crankset Truvativ Descendant Eagle DUB, 30T
Bottom Bracket SRAM GXP DUB, press fit
Rims Giant XCT 29"disc, Tubeless
Hubs Giant Performance Disc, 28H
Spokes Stainless steel, 14g
Tires Fr: Maxxis Forekaster, TR, EXO, Folding, 29x2.35” Rr: Maxxis Rekon Race, TR, EXO, Folding, 29x2.35”
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 Giant bikes are designed for best-in-class weight and ride quality.

All specifications listed are subject to change without notice.

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.


S   163 cm 5’4”/163 cm to 5’8”/172 cm 172 cm
M   171 cm 5’7”/171 cm to 5’11”/180 cm 180 cm
L   179 cm 5’10”/179 cm to 6’2”/188 cm 188 cm
XL   187 cm 6’2”/187 cm to 6’6”/198 cm 198 cm
bike diagram


    S M L XL
A Seat Tube Length (mm) 390 445 480 530
B Seat Tube Angle 73.5° 73.5° 73.5° 73.5°
C Top Tube Length (mm) 585 605 625 645
D Head Tube Length (mm) 95 100 115 130
E Head Tube Angle 69.0° 69.0° 69.0° 69.0°
F Fork Rake (mm) 42 42 42 42
G Trail (mm) 100.5 100.5 100.5 100.5
H Wheelbase (mm) 1100 1121 1142 1163
I Chain Stay Length (mm) 442 442 442 442
J Bottom Bracket Drop (mm) 55 55 55 55
K Stack (mm) 603 608 622 636
L Reach (mm) 406 425 441 457
M Stand Over Height (mm) 700 739 751 782
O Stem Length (mm) 60 70 80 90
P Crank Length (mm) 170 175 175 175
Q Wheel Size 29" 29" 29" 29"
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