2021 Giant Bicycles Fathom 1 M
Build
650B/27.5 in × 2.6 in
Insights
Average stack and reach vs trend of hardtail trail mtb bikes
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 622mm |
| Reach | 445mm |
| Stack to Reach Ratio | 1.4:1 |
| Seat Tube Length, C-T | 430mm |
| Top Tube Length, Effective/Horizontal Unknown | 612mm |
| Head Tube Angle | 66deg |
| Effective Seat Tube Angle, Seat Tube Top | 75deg |
| Head Tube Length | 95mm |
| Bottom Bracket Drop | 60mm |
| Bottom Bracket Height | 298mm |
| Chainstay Length | 435mm |
| Chainstay Length Horizontal | 430.8mm |
| Front-Center | 745.6mm |
| Front-Center Horizontal | 743.2mm |
| Wheelbase | 1174mm |
| Fork Offset/Rake | 44mm |
| Trail | 111.3mm very high |
| Mechanical Trail | 101.6mm |
| Wheel Flop | 41.3mm |
| Standover Height | 726mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 217.5mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 128mm |
1 Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.6in |
| Tire Outer Diameter | 716.1mm |
| Bike Length with Tires | 1890.1mm |
| Crank Length | 170mm |
| Handlebar Width | 780mm |
| Stem Length | 40mm |
| 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 | 181 cm to 180 cm |
Source:https://www.giant-bicycles.com/us/fathom-1-2021