2023 CHIRU Alpin Base
- Category
- Progressive Gravel
- Design
- Drop Bar, Rigid, suspension corrected
- Frame
- Titanium
- Fork
- Titanium
- Features
- Disc brake
Geometry
S | M | L | |
Stack | 576mm | 587mm | 615mm |
Reach | 401mm | 431mm | 443.8mm |
Stack to Reach Ratio | 1.44:1 | 1.36:1 | 1.39:1 |
Seat Tube Length, C-T | 420mm | 450mm | 475mm |
Top Tube Length, Effective/Horizontal Center | 545mm | 575mm | 600mm |
Top Tube Slope | 18.5deg | 15.6deg | 15.4deg |
Head Tube Angle | 67.7deg | 68deg | 68.3deg |
Seat Tube Angle | 74.5deg | 74.5deg | 74.1deg |
Head Tube Length | 135mm | 150mm | 180mm |
Bottom Bracket Drop | 74mm | 70mm | 68mm |
Bottom Bracket Height | 287mm | 291mm | 293mm |
Chainstay Length | 428mm | 430mm | 435mm |
Chainstay Length Horizontal | 421.6mm | 424.3mm | 429.7mm |
Front-Center | 668.6mm | 697.3mm | 718.6mm |
Front-Center Horizontal | 664.5mm | 693.7mm | 715.4mm |
Wheelbase | 1086mm | 1118mm | 1145mm |
Fork Offset/Rake | 50mm | 50mm | 50mm |
Fork Length (Axle-To-Crown) | 427mm | 427mm | 427mm |
Trail | 94mm very high | 91.9mm very high | 89.9mm very high |
Mechanical Trail | 87mm | 85.2mm | 83.5mm |
Wheel Flop | 33mm | 31.9mm | 30.9mm |
Tire to Pedal Spindle | 137.6mm 170 mm cranks | 166.3mm 170 mm cranks | 187.6mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 117mm 170 mm cranks | 121mm 170 mm cranks | 123mm 170 mm cranks |
Base Build
S | M | L | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 50mm | 50mm | 50mm |
Tire Width Max | 55mm | 55mm | 55mm |
Tire Outer Diameter | 722mm | 722mm | 722mm |
Bike Length with Tires | 1808mm | 1840mm | 1867mm |
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
Progressive GravelSource:https://www.chirubikes.com/en/kit-cadre/alpin/