2023 CHIRU Alpin Base M
Build
700C/29 in × 50 mm
Insights
Somewhat aggressive stack and reach vs trend of progressive gravel bikes
Stack and Reach vs. Category Trend
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Geometry
| Stack | 587mm |
| Reach | 431mm |
| Stack to Reach Ratio | 1.36:1 |
| Seat Tube Length, C-T | 450mm |
| Top Tube Length, Effective/Horizontal Center | 575mm |
| Top Tube Slope | 15.6deg |
| Head Tube Angle | 68deg |
| Seat Tube Angle | 74.5deg |
| Head Tube Length | 150mm |
| Bottom Bracket Drop | 70mm |
| Bottom Bracket Height | 291mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 424.3mm |
| Front-Center | 697.3mm |
| Front-Center Horizontal | 693.7mm |
| Wheelbase | 1118mm |
| Fork Offset/Rake | 50mm |
| Fork Length (Axle-To-Crown) | 427mm |
| Trail | 91.9mm very high |
| Mechanical Trail | 85.2mm |
| Wheel Flop | 31.9mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 166.3mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 121mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 50mm |
| Tire Outer Diameter | 722mm |
| Bike Length with Tires | 1840mm |
| Suspension Type | Rigid, suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Titanium |
| Fork Material | Titanium |
| Brake Type | Disc |
Source:https://www.chirubikes.com/en/kit-cadre/alpin/