2021 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
Design deviates from other sizes of Why Cycles Big Iron
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/