2025 Rennstahl Stahl Bikes 781 Base XXL
Build
700C/29 in × 40 mm
Insights
Somewhat aggressive stack and reach vs trend of all-road/gravel bikes
Design deviates from other sizes of Rennstahl Stahl Bikes 781
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 649mm |
| Reach | 429mm |
| Stack to Reach Ratio | 1.51:1 |
| Seat Tube Length, Unknown | 610mm |
| Top Tube Length, Effective/Horizontal Unknown | 625mm |
| Top Tube Slope | 6.2deg |
| Head Tube Angle | 73deg |
| Seat Tube Angle | 73deg |
| Head Tube Length | 230mm |
| Bottom Bracket Drop | 69mm |
| Bottom Bracket Height | 282mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 424.4mm |
| Front-Center | 668.1mm |
| Front-Center Horizontal | 664.6mm |
| Wheelbase | 1089mm |
| Fork Offset/Rake | 55.7mm |
| Trail | 49.1mm mid/neutral |
| Mechanical Trail | 46.9mm |
| Wheel Flop | 13.7mm |
| Tire to Pedal Spindle Distance With 175 mm cranks | 142.1mm |
| Pedal Spindle to Ground Clearance With 175 mm cranks | 107mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 40mm |
| Tire Outer Diameter | 702mm |
| Bike Length with Tires | 1791mm |
| Crank Length | 175mm |
| Handlebar Width | 460mm |
| Stem Length | 120mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Steel |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 16 ft 3 in to |
Source:https://www.1bike4life.com/rennstahl/bikes/781-gravel