2025 Giant Bicycles Fathom 29 Base XL
Build
700C/29 in × 2.5 in
Insights
Average stack and reach vs trend of hardtail trail mtb bikes
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 640mm |
| Reach | 490mm |
| Stack to Reach Ratio | 1.31:1 |
| Seat Tube Length, C-T | 495mm |
| Top Tube Length, Effective/Horizontal Unknown | 662mm |
| Head Tube Angle | 66deg |
| Effective Seat Tube Angle, Seat Tube Top | 75deg |
| Head Tube Length | 115mm |
| Bottom Bracket Drop | 60mm |
| Bottom Bracket Height | 314.5mm |
| Chainstay Length | 435mm |
| Chainstay Length Horizontal | 430.8mm |
| Front-Center | 798.4mm |
| Front-Center Horizontal | 796.2mm |
| Wheelbase | 1227mm |
| Fork Offset/Rake | 44mm |
| Trail | 118.6mm very high |
| Mechanical Trail | 108.3mm |
| Wheel Flop | 44.1mm |
| Standover Height | 790mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 253.9mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 144.5mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.5in |
| Tire Outer Diameter | 749mm |
| Bike Length with Tires | 1976mm |
| Crank Length | 170mm |
| Handlebar Width | 780mm |
| Stem Length | 50mm |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | 130mm |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | N/A |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 187 cm to 198 cm |
Source:https://www.giant-bicycles.com/ca/fathom-29-2025