Fathom
Giant
Trail
Fathom is an alloy trail mountain bike (2025), by Giant, from the Fathom lineup. It is a strong match for a wide range of riders thanks to its fit flexibility, leaning toward a balanced riding position, while being well suited to natural trails and mixed off-road terrain. Standout strengths from the metrics include strong value-for-money versus many similar bikes, strong climbing friendliness for sustained uphill riding, and good fit flexibility for dialing in rider position. The trade-off to keep in mind is a firmer ride feel than comfort-first options and less emphasis on outright speed than speed-focused builds. This summary is a starting point—compare this bike on MatchBikes.com with similar bikes.
Rating

Score Summary
Performance
Built for speed and efficiency
Fit
Dialed-in Fit & Comfort
Value
Specifications
General
Frame
Drivetrain
Wheels
Brakes
Cockpit
Seat
Geometry
| Measurement | SM | MD | LG |
|---|---|---|---|
| Stack Reach Ratio | 1.464 mm | 1.398 mm | 1.343 mm |
| Bottom Bracket Height | 295 mm | 295 mm | 295 mm |
| Front Center | 726 mm | 746 mm | 774 mm |
| Rake | 44 mm | 44 mm | 44 mm |
| Trail | 113 mm | 113 mm | 113 mm |
| Stack | 622 mm | 622 mm | 631 mm |
| Reach | 425 mm | 445 mm | 470 mm |
| Top Tube Length | 592 mm | 612 mm | 639 mm |
| Seat Tube Angle | 75 ° | 75 ° | 75 ° |
| Seat Tube Length | 380 mm | 430 mm | 465 mm |
| Head Tube Angle | 66 ° | 66 ° | 66 ° |
| Head Tube Length | 95 mm | 95 mm | 105 mm |
| Chainstay Length | 438 mm | 438 mm | 438 mm |
| Wheelbase | 1157 mm | 1177 mm | 1206 mm |
| Bottom Bracket Drop | 60 mm | 60 mm | 60 mm |
| Standover Height | 708 mm | 727 mm | 746 mm |
| Wheels | 27" | 27" | 27" |
| Rider Min Height | 163 cm | 170 cm | 178 cm |
| Rider Max Height | 173 cm | 181 cm | 188 cm |




























































