2025 Sombra Grus Base M
Build
700C/29 in × 50 mm
Insights
Somewhat aggressive stack and reach vs trend of all-road/gravel bikes
Stack and Reach vs. Category Trend
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Geometry
| Stack | 576mm |
| Reach | 397mm |
| Stack to Reach Ratio | 1.45:1 |
| Seat Tube Length, C-T | 525mm |
| Top Tube Length, Effective/Horizontal Unknown | 559mm |
| Top Tube Slope | 7.4deg |
| Head Tube Angle | 71deg |
| Seat Tube Angle | 74.5deg |
| Head Tube Length | 140mm |
| Bottom Bracket Drop | 72mm |
| Bottom Bracket Height | 289mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 423.9mm |
| Front-Center | 625.2mm |
| Front-Center Horizontal | 621.1mm |
| Wheelbase | 1045mm |
| Wheelbase Max | 1049mm |
| Fork Offset/Rake | 52mm |
| Fork Length, Unknown | 398mm |
| Trail | 69.3mm high |
| Mechanical Trail | 65.5mm |
| Wheel Flop | 21.3mm |
| Standover Height | 809mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 94.2mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 119mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 50mm |
| Tire Outer Diameter | 722mm |
| Bike Length with Tires | 1767mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Steel |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Source:https://sombracycles.com/product/grus-25-gravel-moonsoon-mist-blue/