2025 CHIRU Nanulak Fat M
Build
26 in × 127 mm
Insights
Somewhat upright stack and reach vs trend of rigid fatbike bikes
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 625mm |
| Reach | 430mm |
| Stack to Reach Ratio | 1.45:1 |
| Seat Tube Length, C-C | 480mm |
| Top Tube Length, Effective/Horizontal HT Top | 610mm |
| Head Tube Angle | 68.5deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 125mm |
| Bottom Bracket Drop | 75mm |
| Bottom Bracket Height | 331.5mm |
| Chainstay Length Horizontal | 580mm |
| Front-Center | 700mm |
| Front-Center Horizontal | 696mm |
| Wheelbase | 1276mm |
| Fork Offset/Rake | 50mm |
| Fork Length (Axle-To-Crown) | 485mm |
| Trail | 106.4mm very high |
| Mechanical Trail | 99mm |
| Wheel Flop | 36.3mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 123.5mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 161.5mm |
Fat Build
| Wheel Size | 26 inch (559mm BSD) |
| Tire Width | 127mm |
| Tire Outer Diameter | 813mm |
| Bike Length with Tires | 2089mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Flat Bar |
| Frame Material | Titanium |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 174 cm to 183 cm |
| PBH | 78 cm to 87 cm |
Source:https://www.chirubikes.com/en/kit-cadre/nanulak/