2025 Rennstahl Stahl Bikes 781 Base M
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 | 575mm |
| Reach | 389mm |
| Stack to Reach Ratio | 1.48:1 |
| Seat Tube Length, Unknown | 530mm |
| Top Tube Length, Effective/Horizontal Unknown | 550mm |
| Top Tube Slope | 7.1deg |
| Head Tube Angle | 72deg |
| Seat Tube Angle | 73.25deg |
| Head Tube Length | 150mm |
| Bottom Bracket Drop | 71mm |
| Bottom Bracket Height | 280mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 424.1mm |
| Front-Center | 601.1mm |
| Front-Center Horizontal | 596.9mm |
| Wheelbase | 1021mm |
| Fork Offset/Rake | 42mm |
| Trail | 69.9mm high |
| Mechanical Trail | 66.5mm |
| Wheel Flop | 20.5mm |
| Tire to Pedal Spindle Distance With 172.5 mm cranks | 77.6mm |
| Pedal Spindle to Ground Clearance With 172.5 mm cranks | 107.5mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 40mm |
| Tire Outer Diameter | 702mm |
| Bike Length with Tires | 1723mm |
| Crank Length | 172.5mm |
| Handlebar Width | 420mm |
| Stem Length | 90mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Steel |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 14 ft 0 in to |
Source:https://www.1bike4life.com/rennstahl/bikes/781-gravel