Giant Fathom 29 - 2025

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.

OverDrive
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.

Tubeless System
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.

		S	M	L	XL
A	Seat Tube Length (mm)	380	430	465	495
A1	Seat Post Insertion Depth (mm)	300	200	235	285
B	Seat Tube Angle	75.0°	75.0°	75.0°	75.0°
C	Top Tube Length (mm)	592	612	639	662
D	Head Tube Length (mm)	95	95	105	115
E	Head Tube Angle	66.0°	66.0°	66.0°	66.0°
F	Fork Rake (mm)	44	44	44	44
G	Trail (mm)	122	122	122	122
H	Wheelbase (mm)	1157	1177	1206	1230
I	Chain Stay Length (mm)	438	438	438	438
J	Bottom Bracket Drop (mm)	60	60	60	60
K	Stack (mm)	622	622	631	640
L	Reach (mm)	425	445	470	490
M	Stand Over Height (mm)	727	746	764	791
N	Handlebar Width (mm)	780	780	780	780
O	Stem Length (mm)	40	40	50	50
P	Crank Length (mm)	165	170	170	170
Q	Wheel Size	29"	29"	29"	29"