2025 Giant Fathom vs 2025 Giant Fathom 29
The Giant Fathom 29 size closest to your M is the M. Compare the M instead
What changes on the Giant Fathom 29
Compared with the Giant Fathom in M, the Giant Fathom 29 in S places the top of the head tube at about the same height and 20 mm further back, relative to the bottom bracket. Its wheelbase is 20 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- ±0 mm
- About the same height
- Frame reach
- −20 mm
- Shorter frame reach
- Wheelbase
- −20 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 numbers we have for size M are missing the chainstay length. The numbers below still compare.
Geometry side by side
| Measurement | Giant Fathom M | Giant Fathom 29 S | Difference |
|---|---|---|---|
| Reach | 445 | 425 | −20 mm |
| Stack | 622 | 622 | ±0 mm |
| Head tube angle | 66 | 66 | ±0.0° |
| Seat tube angle | 75 | 75 | ±0.0° |
| Wheelbase | 1177 | 1157 | −20 mm |
| Seat tube length | 430 | 380 | −50 mm |
| Effective top tube | not listed | 592 | |
| BB height | not listed | 314 | |
| Standover | not listed | 727 |
Differences are the Giant Fathom 29 minus the Giant Fathom. Full charts: 2025 Giant Fathom, 2025 Giant Fathom 29.
Where each sits in its class
Giant FathomGiant Fathom 29
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 Fathom1 | Giant Fathom 29Fathom 29 |
|---|---|---|
| Frame | Giant Fathom | Giant Fathom 29 |
| Fork | Giant Crest 34 | Giant STL 34 |
| Shifter | SRAM SX Eagle | Shimano CUES SL-6000 |
| Derailleur | SRAM NX Eagle SX | Shimano CUES U6000 |
| Cassette | SRAM PG-1150 SX | Shimano CS-LG300 |
| Chain | SRAM SX Eagle | KMC X11 |
| Crankset | SRAM SX Eagle Powerspline | Shimano CUES U6000 |
| Chainring | SRAM SX Eagle | Shimano CUES U6030 |
| Bottom bracket | SRAM DUB GX | not listed |
| Wheelset | Giant AM | Giant AM 29 |
| Tire | Maxxis Ardent Race | Maxxis Minion DHF, Maxxis Aggressor |
| Brake | Shimano MT420, Shimano MT410 | Shimano MT420 |
| Rotor | Shimano RT-26 | Shimano RT-26 |
| Handlebar | Giant Contact SL TR35 | Giant Contact SL TR35 |
| Stem | Giant Contact SL | Giant Contact SL 35 |
| Dropper post | Giant Contact Switch | Giant Contact Switch AT |
| Saddle | Giant Romero | Giant Romero |
| Grips | not listed | Giant Sole-O |
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