2022 Why Cycles Big Iron Base
- Category
- Rigid Fatbike
- Design
- Flat Bar, Rigid, suspension corrected
- Frame
- Titanium
- Fork
- Carbon/Composite
- Features
- Disc brake, Single-speed capable
Geometry
S | M | L | XL | |
Stack | 611mm | 622mm | 627mm | 637mm |
Reach | 427mm | 442mm | 468mm | 484mm |
Stack to Reach Ratio | 1.43:1 | 1.41:1 | 1.34:1 | 1.32:1 |
Seat Tube Length, Unknown | 355mm | 407mm | 457mm | 492mm |
Top Tube Length, Effective/Horizontal HT Top | 574mm | 614mm | 635mm | 660mm |
Top Tube Slope | 27.2deg | 22.5deg | 17.5deg | 14.9deg |
Head Tube Angle | 68.2deg | 68.2deg | 68.2deg | 68.2deg |
Seat Tube Angle | 74deg | 73deg | 73deg | 73deg |
Head Tube Length | 116mm | 127mm | 132mm | 143mm |
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 Max | 460mm | 460mm | 460mm | 460mm |
Chainstay Length Horizontal | 440.4mm | 440.4mm | 440.4mm | 440.4mm |
Chainstay Length Horizontal Max | 455.5mm | 455.5mm | 455.5mm | 455.5mm |
Front-Center | 684.6mm | 711.5mm | 734.4mm | 757.3mm |
Front-Center Horizontal | 681.6mm | 708.6mm | 731.6mm | 754.6mm |
Wheelbase | 1122mm | 1149mm | 1172mm | 1195mm |
Wheelbase Max | 1137.2mm | 1164.2mm | 1187.2mm | 1210.2mm |
Fork Offset/Rake | 51mm | 51mm | 51mm | 51mm |
Fork Length (Axle-To-Crown) | 490mm | 490mm | 490mm | 490mm |
Trail | 107.6mm very high | 107.6mm very high | 107.6mm very high | 107.6mm very high |
Mechanical Trail | 99.9mm | 99.9mm | 99.9mm | 99.9mm |
Wheel Flop | 37.1mm | 37.1mm | 37.1mm | 37.1mm |
Tire to Pedal Spindle | 108.3mm 170 mm cranks | 135.2mm 170 mm cranks | 158.1mm 170 mm cranks | 181mm 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
S | M | L | 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 | 1934.6mm | 1961.6mm | 1984.6mm | 2007.6mm |
Published Sizing Recommendations
Height | 5 ft 1 in to 5 ft 6 in | 5 ft 5 in to 5 ft 10 in | 5 ft 9 in to 6 ft 2 in | 6 ft 1 in to 6 ft 6 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/