2018 Why Cycles Big Iron Base Medium
Build
650B/27.5 in × 4.5 in
Insights
Average stack and reach vs trend of rigid fatbike bikes
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 615mm |
| Reach | 437mm |
| Stack to Reach Ratio | 1.41:1 |
| Seat Tube Length, C-T | 407mm |
| Top Tube Length, Effective/Horizontal HT Top | 606mm |
| Top Tube Slope | 22.1deg |
| Head Tube Angle | 68.7deg |
| Seat Tube Angle | 73deg |
| Head Tube Length | 123mm |
| Bottom Bracket Drop | 64mm |
| Bottom Bracket Height | 342.3mm |
| Chainstay Length | 445mm |
| Chainstay Length Horizontal | 440.4mm |
| Front-Center | 704.5mm |
| Front-Center Horizontal | 701.6mm |
| Wheelbase | 1142mm |
| Fork Offset/Rake | 51mm |
| Fork Length (Axle-To-Crown) | 490mm |
| Trail | 103.7mm very high |
| Mechanical Trail | 96.6mm |
| Wheel Flop | 35.1mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 128.2mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 172.3mm |
Base Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 4.5in |
| Tire Outer Diameter | 812.6mm |
| Bike Length with Tires | 1954.6mm |
| Suspension Type | Rigid, suspension corrected |
| Bar Type | Flat Bar |
| Frame Material | Titanium |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 5 ft 6 in to 5 ft 10 in |
Source:https://www.whycycles.com/our-bikes/big-iron-fat-bike/