2018 Why Cycles Big Iron Base
- Category
- Rigid Fatbike
- Design
- Flat Bar, Rigid, suspension corrected
- Frame
- Titanium
- Fork
- Carbon/Composite
- Features
- Disc brake
Geometry
Small | Medium | Large | XL | |
Stack | 606mm | 615mm | 620mm | 630mm |
Reach | 417mm | 437mm | 457mm | 477mm |
Stack to Reach Ratio | 1.45:1 | 1.41:1 | 1.36:1 | 1.32:1 |
Seat Tube Length, C-T | 355mm | 407mm | 457mm | 492mm |
Top Tube Length, Effective/Horizontal HT Top | 584mm | 606mm | 628mm | 651mm |
Top Tube Slope | 27.1deg | 22.1deg | 17.2deg | 14.4deg |
Head Tube Angle | 68.7deg | 68.7deg | 68.7deg | 68.7deg |
Seat Tube Angle | 73deg | 73deg | 73deg | 73deg |
Head Tube Length | 113mm | 123mm | 128mm | 139mm |
Bottom Bracket Drop | 64mm | 64mm | 64mm | 64mm |
Bottom Bracket Height | 342.3mm | 342.3mm | 342.3mm | 342.3mm |
Chainstay Length | 445mm | 445mm | 445mm | 445mm |
Chainstay Length Horizontal | 440.4mm | 440.4mm | 440.4mm | 440.4mm |
Front-Center | 680.6mm | 704.5mm | 723.5mm | 750.4mm |
Front-Center Horizontal | 677.6mm | 701.6mm | 720.6mm | 747.6mm |
Wheelbase | 1118mm | 1142mm | 1161mm | 1188mm |
Fork Offset/Rake | 51mm | 51mm | 51mm | 51mm |
Fork Length (Axle-To-Crown) | 490mm | 490mm | 490mm | 490mm |
Trail | 103.7mm very high | 103.7mm very high | 103.7mm very high | 103.7mm very high |
Mechanical Trail | 96.6mm | 96.6mm | 96.6mm | 96.6mm |
Wheel Flop | 35.1mm | 35.1mm | 35.1mm | 35.1mm |
Tire to Pedal Spindle | 104.3mm 170 mm cranks | 128.2mm 170 mm cranks | 147.2mm 170 mm cranks | 174.1mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 172.3mm 170 mm cranks | 172.3mm 170 mm cranks | 172.3mm 170 mm cranks | 172.3mm 170 mm cranks |
Base Build
Small | Medium | Large | XL | |
Wheel Size | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD |
Tire Width | 4.5in | 4.5in | 4.5in | 4.5in |
Tire Outer Diameter | 812.6mm | 812.6mm | 812.6mm | 812.6mm |
Bike Length with Tires | 1930.6mm | 1954.6mm | 1973.6mm | 2000.6mm |
Published Sizing Recommendations
Height | 5 ft 0 in to 5 ft 7 in | 5 ft 6 in to 5 ft 10 in | 5 ft 9 in to 6 ft 2 in | 6 ft 1 in to 6 ft 7 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.whycycles.com/our-bikes/big-iron-fat-bike/