2025 Rennstahl Stahl Bikes 781 Base
- Category
- All-road/Gravel
- Design
- Drop Bar, Rigid, non-suspension corrected
- Frame
- Steel
- Fork
- Carbon/Composite
- Features
- Disc brake
Geometry
XS | S | M | L | XL | XXL | |
Stack | 552mm | 555mm | 575mm | 590mm | 610mm | 649mm |
Reach | 375mm | 378mm | 389mm | 393mm | 407mm | 429mm |
Stack to Reach Ratio | 1.47:1 | 1.47:1 | 1.48:1 | 1.5:1 | 1.5:1 | 1.51:1 |
Seat Tube Length, Unknown | 420mm | 470mm | 530mm | 550mm | 580mm | 610mm |
Top Tube Length, Effective/Horizontal Unknown | 535mm | 530mm | 550mm | 565mm | 585mm | 625mm |
Top Tube Slope | 16.8deg | 11.5deg | 7.1deg | 6.6deg | 5.5deg | 6.2deg |
Head Tube Angle | 71deg | 72.5deg | 72deg | 72.5deg | 73deg | 73deg |
Seat Tube Angle | 74deg | 74deg | 73.25deg | 73.25deg | 73deg | 73deg |
Head Tube Length | 125mm | 140mm | 150mm | 165mm | 185mm | 230mm |
Bottom Bracket Drop | 72mm | 72mm | 71mm | 70mm | 69mm | 69mm |
Bottom Bracket Height | 279mm | 279mm | 280mm | 281mm | 282mm | 282mm |
Chainstay Length | 430mm | 430mm | 430mm | 430mm | 430mm | 430mm |
Chainstay Length Horizontal | 423.9mm | 423.9mm | 424.1mm | 424.3mm | 424.4mm | 424.4mm |
Front-Center | 580.6mm | 585.5mm | 601.1mm | 605.8mm | 621.4mm | 668.1mm |
Front-Center Horizontal | 576.1mm | 581.1mm | 596.9mm | 601.7mm | 617.6mm | 664.6mm |
Wheelbase | 1000mm | 1005mm | 1021mm | 1026mm | 1042mm | 1089mm |
Fork Offset/Rake | 33.8mm | 48.4mm | 42mm | 42.7mm | 43.2mm | 55.7mm |
Trail | 85.1mm very high | 59.9mm mid/neutral | 69.9mm high | 65.9mm high | 62.1mm mid/neutral | 49.1mm mid/neutral |
Mechanical Trail | 80.4mm | 57.1mm | 66.5mm | 62.8mm | 59.4mm | 46.9mm |
Wheel Flop | 26.2mm | 17.2mm | 20.5mm | 18.9mm | 17.4mm | 13.7mm |
Tire to Pedal Spindle | 59.6mm 170 mm cranks | 64.5mm 170 mm cranks | 77.6mm 172.5 mm cranks | 82.3mm 172.5 mm cranks | 95.4mm 175 mm cranks | 142.1mm 175 mm cranks |
Pedal Spindle to Ground Clearance | 109mm 170 mm cranks | 109mm 170 mm cranks | 107.5mm 172.5 mm cranks | 108.5mm 172.5 mm cranks | 107mm 175 mm cranks | 107mm 175 mm cranks |
Base Build
XS | S | M | L | XL | XXL | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 40mm | 40mm | 40mm | 40mm | 40mm | 40mm |
Tire Width Max | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm |
Tire Outer Diameter | 702mm | 702mm | 702mm | 702mm | 702mm | 702mm |
Bike Length with Tires | 1702mm | 1707mm | 1723mm | 1728mm | 1744mm | 1791mm |
Crank Length | 170mm | 170mm | 172.5mm | 172.5mm | 175mm | 175mm |
Handlebar Width | 400mm | 400mm | 420mm | 440mm | 440mm | 460mm |
Stem Length | 70mm | 80mm | 90mm | 100mm | 110mm | 120mm |
Published Sizing Recommendations
Height | 12 ft 11 in to | 13 ft 9 in to | 14 ft 0 in to | 14 ft 10 in to | 15 ft 5 in to | 16 ft 3 in to |
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
All-road/GravelSource:https://www.1bike4life.com/rennstahl/bikes/781-gravel