2025 Giant Fathom 29 vs 2025 Giant Fathom
The L is the Giant Fathom size closest to your XL Giant Fathom 29. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the Giant Fathom
Compared with the Giant Fathom 29 in XL, the Giant Fathom in L places the top of the head tube 9 mm lower and 20 mm further back, relative to the bottom bracket. Its wheelbase is 24 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −9 mm
- Lower front end
- Frame reach
- −20 mm
- Shorter frame reach
- Wheelbase
- −24 mm
- Shorter: quicker to change direction
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
We can't draw these frames yet. The Giant Fathom 29 numbers we have for size XL are missing the chainstay length. The numbers below still compare.
Geometry side by side
| Measurement | Giant Fathom 29 XL | Giant Fathom L | Difference |
|---|---|---|---|
| Reach | 490 | 470 | −20 mm |
| Stack | 640 | 631 | −9 mm |
| Head tube angle | 66 | 66 | ±0.0° |
| Seat tube angle | 75 | 75 | ±0.0° |
| Effective top tube | 662 | not listed | |
| Wheelbase | 1230 | 1206 | −24 mm |
| BB height | 314 | not listed | |
| Standover | 791 | not listed | |
| Seat tube length | 495 | 465 | −30 mm |
Differences are the Giant Fathom minus the Giant Fathom 29. Full charts: 2025 Giant Fathom 29, 2025 Giant Fathom.
Where each sits in its class
Giant Fathom 29Giant Fathom
Each bike is ranked against the other trail bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | Giant Fathom 29Fathom 29 | Giant Fathom1 |
|---|---|---|
| Frame | Giant Fathom 29 | Giant Fathom |
| Fork | Giant STL 34 | Giant Crest 34 |
| Shifter | Shimano CUES SL-6000 | SRAM SX Eagle |
| Derailleur | Shimano CUES U6000 | SRAM NX Eagle SX |
| Cassette | Shimano CS-LG300 | SRAM PG-1150 SX |
| Chain | KMC X11 | SRAM SX Eagle |
| Crankset | Shimano CUES U6000 | SRAM SX Eagle Powerspline |
| Chainring | Shimano CUES U6030 | SRAM SX Eagle |
| Wheelset | Giant AM 29 | Giant AM |
| Tire | Maxxis Minion DHF, Maxxis Aggressor | Maxxis Ardent Race |
| Brake | Shimano MT420 | Shimano MT420, Shimano MT410 |
| Rotor | Shimano RT-26 | Shimano RT-26 |
| Handlebar | Giant Contact SL TR35 | Giant Contact SL TR35 |
| Stem | Giant Contact SL 35 | Giant Contact SL |
| Grips | Giant Sole-O | not listed |
| Dropper post | Giant Contact Switch AT | Giant Contact Switch |
| Saddle | Giant Romero | Giant Romero |
| Bottom bracket | not listed | SRAM DUB GX |
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