2023 CHIRU Alpin Base S
Build
700C/29 in × 50 mm
Insights
Average stack and reach vs trend of progressive gravel bikes
Design deviates from other sizes of CHIRU Alpin
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 576mm |
| Reach | 401mm |
| Stack to Reach Ratio | 1.44:1 |
| Seat Tube Length, C-T | 420mm |
| Top Tube Length, Effective/Horizontal Center | 545mm |
| Top Tube Slope | 18.5deg |
| Head Tube Angle | 67.7deg |
| Seat Tube Angle | 74.5deg |
| Head Tube Length | 135mm |
| Bottom Bracket Drop | 74mm |
| Bottom Bracket Height | 287mm |
| Chainstay Length | 428mm |
| Chainstay Length Horizontal | 421.6mm |
| Front-Center | 668.6mm |
| Front-Center Horizontal | 664.5mm |
| Wheelbase | 1086mm |
| Fork Offset/Rake | 50mm |
| Fork Length (Axle-To-Crown) | 427mm |
| Trail | 94mm very high |
| Mechanical Trail | 87mm |
| Wheel Flop | 33mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 137.6mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 117mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 50mm |
| Tire Outer Diameter | 722mm |
| Bike Length with Tires | 1808mm |
| 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/