Giant ATX 3 (2020) Mountain Bike

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From parkways to paths and everything in between, this versatile bike can add some spice to your commute or fitness routine. With its flat handlebar, upright positioning and suspension fork, it’s cool and capable on-road or off-road.

With a rugged personality and a smooth riding style, ATX features the familiar flat-handlebar look of a traditional mountain bike. It has a lightweight yet durable ALUXX aluminum frame and a suspension fork with 100mm of smooth travel to soak up bumps. The wheel diameter varies based on bike size, with 26-inch wheels on smaller frames and 27.5 on larger ones. This tailors the bike’s handling to a rider’s height. Powerful brakes deliver confident handling in all types of weather, and integrated mounts make it easy to add racks or fenders to suit your riding adventures.

Key Performance Factors

All-terrain versatility

With a mountain bike style flat handlebar, and suspension fork, you can ride road or dirt with confidence.

Lightweight and durable

Frameset constructed with high-quality ALUXX aluminum.

Comfort and stability

Frame geometry puts the rider in a position that balances efficiency with stability on rough roads, paths or trails.


Sizes XXS, XS, S, M, L, XL
Colors Metallic Black / Gray, Black / Pure Red, Olive Green
Frame ALUXX-Grade Aluminum
Fork SR Suntour M3030A 26/27.5", 75mm, preload adjustable
Shock N/A
Handlebar Giant Sport, 25.4, alloy
Stem Giant Sport, alloy, 15-degree
Seatpost Giant Sport, 30.9x350
Saddle Giant custom
Pedals platform
Shifters Shimano EF41
Front Derailleur Shimano Tourney
Rear Derailleur Shimano Tourney
Brakes MTB alloy linear pull
Brake Levers Shimano EF41
Cassette Shimano MF-TZ500, 14x34
Chain KMC Z7
Crankset Prowheel forged, 24/34/42
Bottom Bracket cartridge
Rims Giant GX06 26/27.5, alloy, double wall, 19mm inner width
Hubs alloy, sealed bearing
Spokes stainless, 14g
Tires Giant QuickCross 27.5x2.1/26x2.1
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 and prices 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.


XXS (26")   5’0” 5’0”/152 cm to 5’2”/157 cm 5’2”
XS (26")   5’2” 5’2”/157 cm to 5’4”/162 cm 5’4”
S (27.5")   5’4” 5’4”/162 cm to 5’7”/170 cm 5’7”
M (27.5")   5’7” 5’7”/170 cm to 5’9”/175 cm 5’9”
L (27.5")   5’9” 5’9”/175 cm to 6’1”/185 cm 6’1”
bike diagram


    XXS (26") XS (26") S (27.5") M (27.5") L (27.5")
A Seat Tube Length (inch) 13.8 15.2 16.5 17.9 19.9
B Seat Tube Angle 73.5° 73.5° 73.5° 73.0° 73.0°
C Top Tube Length (inch) 21.9 22.2 22.6 23.2 24
D Head Tube Length (inch) 3.7 4.1 3.7 4.3 5.7
E Head Tube Angle 68.0° 68.0° 68.0° 68.0° 68.0°
F Fork Rake (inch) 1.7 1.7 1.7 1.7 1.7
G Trail (inch) 3.6 3.6 3.6 3.6 3.6
H Wheelbase (inch) 41.9 42.4 42.5 43 43.9
I Chain Stay Length (inch) 16.5 16.5 17.1 17.1 17.1
J Bottom Bracket Drop (inch) 1.4 1.4 2 2 2
K Stack (inch) 21.9 22.2 22.9 23.4 24.7
L Reach (inch) 15.4 15.7 15.9 16.1 16.5
M Stand Over Height (inch) 27.1 28 28.4 29.4 31.1
N Handlebar Width (inch) 24.4 26 26 26 27.6
O Stem Length (inch) 2 2 2.8 2.8 3.5
P Crank Length (inch) 6.3 6.5 6.7 6.7 6.9
Q Wheel Size 26" 26" 27.5" 27.5" 27.5"
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