2016 Sonder Vir Fortis Base
- Category
- Rigid Fatbike
- Design
- Flat Bar, Rigid, suspension corrected
- Frame
- Carbon/Composite
- Fork
- Carbon/Composite
- Features
- Disc brake
Geometry
Small | Medium | Large | |
Stack | 586mm | 595mm | 614mm |
Reach | 406mm | 423mm | 437mm |
Stack to Reach Ratio | 1.44:1 | 1.41:1 | 1.41:1 |
Seat Tube Length, Unknown | 406mm | 457mm | 505mm |
Top Tube Length, Effective/Horizontal Unknown | 580mm | 605mm | 625mm |
Top Tube Slope | 20.7deg | 15.8deg | 12.6deg |
Head Tube Angle | 68.5deg | 68.5deg | 68.5deg |
Seat Tube Angle | 73.5deg | 73deg | 73deg |
Head Tube Length | 100mm | 110mm | 130mm |
Bottom Bracket Drop | 60mm | 60mm | 60mm |
Bottom Bracket Height | 327.5mm | 327.5mm | 327.5mm |
Chainstay Length | 445mm | 445mm | 445mm |
Chainstay Length Horizontal | 440.9mm | 440.9mm | 440.9mm |
Front-Center | 664.8mm | 684.7mm | 706.6mm |
Front-Center Horizontal | 662.1mm | 682.1mm | 704.1mm |
Wheelbase | 1103mm | 1123mm | 1145mm |
Fork Offset/Rake | 45mm | 45mm | 45mm |
Trail | 104.3mm very high | 104.3mm very high | 104.3mm very high |
Mechanical Trail | 97mm | 97mm | 97mm |
Wheel Flop | 35.6mm | 35.6mm | 35.6mm |
Tire to Pedal Spindle | 107.3mm 170 mm cranks | 127.3mm 170 mm cranks | 149.2mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 157.5mm 170 mm cranks | 157.5mm 170 mm cranks | 157.5mm 170 mm cranks |
Base Build
Small | Medium | Large | |
Wheel Size | 26 in 559 mm BSD | 26 in 559 mm BSD | 26 in 559 mm BSD |
Tire Width | 4.25in | 4.25in | 4.25in |
Tire Width Max | 4.8in | 4.8in | 4.8in |
Tire Outer Diameter | 774.9mm | 774.9mm | 774.9mm |
Bike Length with Tires | 1877.9mm | 1897.9mm | 1919.9mm |
Published Sizing Recommendations
Height | 5 ft 2 in to 5 ft 7 in | 5 ft 6 in to 5 ft 10 in | 5 ft 9 in to 6 ft 2 in |
Stack and Reach vs. Category Trend
Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive
The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.
Learn more about the Upright/Aggressive ScaleCategory Trend
Rigid FatbikeSource:https://www.alpkit.com/sonder/sonder-vir-fortis