Which size or configuration labels have geometry for the 2025 Giant Fathom 29?

Geometry is listed for S, M, L, and XL.

What are the reach and stack of the 2025 Giant Fathom 29 in size L?

In size L, reach is 470 mm and stack is 631 mm.

What is the head tube angle of the 2025 Giant Fathom 29?

The head tube angle is 66 degrees in every size.

What does the 2025 Giant Fathom 29 ship with?

The stock build includes Giant Fathom 29, Giant STL 34, Shimano CUES SL-6000, and Giant AM 29.

Which years of the Giant Fathom 29 are on Quiver?

Quiver has the Giant Fathom 29 for 2025, 2023, 2022, and 2021.

2025 Giant Fathom 29 geometry and specs

Key facts

Brand: Giant
Model: Fathom 29
Model year: 2025
Type: Trail
Geometry labels: S, M, L, and XL
Drivetrain: Shimano CUES U6000
Fork: Giant STL 34
Wheels: Giant AM 29
Geometry: Complete for every size
Source: giant-bicycles.com
Checked: Oct 12, 2026

Geometry by size

2025 Giant Fathom 29 geometry by size
Measurement	S	M	L	XL
Reach(mm)	425	445	470	490
Stack(mm)	622	622	631	640
Head tube angle(°)	66	66	66	66
Seat tube angle(°)	75	75	75	75
Effective top tube(mm)	592	612	639	662
Wheelbase(mm)	1157	1177	1206	1230
BB height(mm)	314	314	314	314
Standover(mm)	727	746	764	791
Seat tube length(mm)	380	430	465	495

Sources agree

How to read a geometry chart

Stock build

18 parts

Frame

Giant Fathom 29

Frame

Suspension

Giant STL 34

ForkWheel size 29Spring type Air

Drivetrain

Shimano CUES SL-6000

Shifter

Shimano CUES U6000

DerailleurSpeeds 10Maximum cog 48 tActuation type ElectronicMount type directCassette compatibility LINKGLIDEClutch

Shimano CS-LG300

Cassette

KMC X11

ChainSpeeds 11Links 118

Shimano CUES U6000

CranksetChainring interface Direct Mount (3-Bolt)Spindle / BB interface BSA

Shimano CUES U6030

ChainringSpeeds 11

Wheels & Tires

Giant AM 29

Wheelset

Maxxis Minion DHF

Tire

Maxxis Aggressor

Tire

Brakes

Shimano MT420

Brake

Shimano RT-26

Rotor

Cockpit

Giant Contact SL TR35

HandlebarClamp diameter 35mmWidth ~800mmRise 20mmMaterial 7075 aluminum alloyBacksweep 5°Upsweep 9°

Giant Contact SL 35

StemBar clamp diameter 35mmRise 0°

Giant Sole-O

Grips

Seatpost & Saddle

Giant Contact Switch AT

Dropper postDiameter 30.9mmInsertion length 395mmTotal length ~395mmWeight ~490 g

Giant Romero

SaddleWeight 325 gLength 277mm

Keep your Fathom 29 in Quiver

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Quick answers

Which size or configuration labels have geometry for the 2025 Giant Fathom 29?: Geometry is listed for S, M, L, and XL.
What are the reach and stack of the 2025 Giant Fathom 29 in size L?: In size L, reach is 470 mm and stack is 631 mm.
What is the head tube angle of the 2025 Giant Fathom 29?: The head tube angle is 66 degrees in every size.
What does the 2025 Giant Fathom 29 ship with?: The stock build includes Giant Fathom 29, Giant STL 34, Shimano CUES SL-6000, and Giant AM 29.
Which years of the Giant Fathom 29 are on Quiver?: Quiver has the Giant Fathom 29 for 2025, 2023, 2022, and 2021.