2023 Principia Gravel 40 Base 51cm
Build
700C/29 in × 38 mm
Insights
Somewhat aggressive stack and reach vs trend of all-road/gravel bikes
Design deviates from other sizes of Principia Gravel 40
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 531.9mm |
| Reach | 373.5mm |
| Stack to Reach Ratio | 1.42:1 |
| Seat Tube Length, Unknown | 490mm |
| Top Tube Length, Actual C-C | 526mm |
| Top Tube Slope | 6.8deg |
| Head Tube Angle | 69.5deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 115mm |
| Bottom Bracket Drop | 67mm |
| Bottom Bracket Height | 282mm |
| Chainstay Length | 445mm |
| Chainstay Length Horizontal | 439.9mm |
| Front-Center | 604.4mm |
| Front-Center Horizontal | 600.7mm |
| Wheelbase | 1040.6mm |
| Fork Offset/Rake | 50mm |
| Trail | 77.1mm high |
| Mechanical Trail | 72.2mm |
| Wheel Flop | 25.3mm |
| Standover Height | 748mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 85.4mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 112mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 38mm |
| Tire Outer Diameter | 698mm |
| Bike Length with Tires | 1738.6mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Aluminum |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Source:https://principia.dk/gravel/gravel-alu/gravel-40---sand-pg-2124