Professional Grade raw carbon fiber is woven in our composite factory to produce our lightest, stiffest and highest quality frames. This is the technology used by Giant’s pro racers in almost every cycling discipline.
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Balanced geometry with a 75-degree seattube angle puts the rider in a powerful pedaling position on the climbs, while a slacker 66-degree head angle boosts confidence and control on technical descents.
Lightweight ALUXX SL aluminum hardtail frame offers agile acceleration and maneuverability to help riders climb, corner and hammer the flats with efficiency and speed.
Giant Crest 34 suspension fork with 130mm of travel absorbs roots, rocks and ruts. Grippy, high-volume tires boost traction on rugged terrain. And a dropper seatpost with handlebar remote lets you adjust saddle height on the fly for confident positioning on changing terrain.
Built on a lightweight ALUXX SL aluminum frameset with progressive trail geometry, Fathom 29 is designed for the added stability and roll-over capabilities of 29-inch wheels with grippy, high-volume 2.5-inch tires. It has a number of trail-specific features including a 130mm suspension fork and dropper seatpost. Here’s a look at its key technologies:

Professional Grade raw carbon fiber is woven in our composite factory to produce our lightest, stiffest and highest quality frames. This is the technology used by Giant’s pro racers in almost every cycling discipline.

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.

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 (inch) | 15 | 16.9 | 18.3 | 19.5 |
| B | SEAT TUBE ANGLE | 75.0° | 75.0° | 75.0° | 75.0° |
| C | TOP TUBE LENGTH (inch) | 23.3 | 24.1 | 25.2 | 26.1 |
| D | HEAD TUBE LENGTH (inch) | 3.7 | 3.7 | 4.1 | 4.5 |
| E | HEAD TUBE ANGLE | 66.0° | 66.0° | 66.0° | 66.0° |
| F | FORK RAKE (inch) | 1.7 | 1.7 | 1.7 | 1.7 |
| G | TRAIL (inch) | 4.8 | 4.8 | 4.8 | 4.8 |
| H | WHEELBASE (inch) | 45.4 | 46.2 | 47.4 | 48.3 |
| I | CHAIN STAY LENGTH (inch) | 17.1 | 17.1 | 17.1 | 17.1 |
| J | BOTTOM BRACKET DROP (inch) | 2.4 | 2.4 | 2.4 | 2.4 |
| K | STACK (inch) | 24.5 | 24.5 | 24.8 | 25.2 |
| L | REACH (inch) | 16.7 | 17.5 | 18.5 | 19.3 |
| M | STAND OVER HEIGHT (inch) | 28.7 | 29.3 | 30.1 | 31.1 |
| N | HANDLEBAR WIDTH (inch) | 30.7 | 30.7 | 30.7 | 30.7 |
| O | STEM LENGTH (inch) | 1.6 | 1.6 | 2 | 2 |
| P | CRANK LENGTH (inch) | 6.5 | 6.7 | 6.7 | 6.7 |
| Q | WHEEL SIZE | 29" | 29" | 29" | 29" |
Note: In Store Pick Up Only
Ships within 48 hours · Estimated delivery Jun 21 - Jun 26
US$40
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