Fathom 29
Giant
Trail
Fathom 29 is an alloy trail mountain bike (2025), from Giant, in the Fathom series. Rider-wise, it fits a wide range of riders thanks to its fit flexibility, with a setup that gives you a balanced riding position, and is well suited to natural trails and mixed off-road terrain. Its profile is strongest in areas like strong value-for-money versus many similar bikes, strong climbing friendliness for sustained uphill riding, and good fit flexibility for dialing in rider position. Compared with more specialized alternatives, the compromise is a firmer ride feel than comfort-first options and less emphasis on outright speed than speed-focused builds. Use MatchBikes.com to compare this bike with nearby trail options.
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 | XL |
|---|---|---|---|---|
| Stack Reach Ratio | 1.464 mm | 1.398 mm | 1.343 mm | 1.306 mm |
| Bottom Bracket Height | 314 mm | 314 mm | 314 mm | 314 mm |
| Front Center | 726 mm | 746 mm | 774 mm | 798 mm |
| Rake | 44 mm | 44 mm | 44 mm | 44 mm |
| Trail | 122 mm | 122 mm | 122 mm | 122 mm |
| Stack | 622 mm | 622 mm | 631 mm | 640 mm |
| Reach | 425 mm | 445 mm | 470 mm | 490 mm |
| Top Tube Length | 592 mm | 612 mm | 639 mm | 662 mm |
| Seat Tube Angle | 75 ° | 75 ° | 75 ° | 75 ° |
| Seat Tube Length | 380 mm | 430 mm | 465 mm | 495 mm |
| Head Tube Angle | 66 ° | 66 ° | 66 ° | 66 ° |
| Head Tube Length | 95 mm | 95 mm | 105 mm | 115 mm |
| Chainstay Length | 438 mm | 438 mm | 438 mm | 438 mm |
| Wheelbase | 1157 mm | 1177 mm | 1206 mm | 1230 mm |
| Bottom Bracket Drop | 60 mm | 60 mm | 60 mm | 60 mm |
| Standover Height | 727 mm | 746 mm | 764 mm | 791 mm |
| Wheels | 29" | 29" | 29" | 29" |
| Rider Min Height | 163 cm | 170 cm | 178 cm | 186 cm |
| Rider Max Height | 173 cm | 181 cm | 189 cm | 198 cm |




























































