Rennstahl 781 Gravel

Name: Rennstahl 781 Gravel
Brand: Rennstahl

2025 RoadGravel Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €2,018 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 13 38t / 10–48t
Gear range: 480%
Frame: Steel
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 165–171
XS 155–167
MD 168–180
LG 177–187
XL 184–201
XXL 195–205

Components

9 of 15 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Suspension

1 part

Fork
- Parapera

Drivetrain

2 parts

Brakes

1 part

Brakes
- Campagnolo Ekar

Wheels and tires

1 part

Rims
- Fulcrum

Cockpit and contact points

5 parts

Other components

5 parts

Bell

without Not identified
Fenders

without Not identified
Lights

Front: without, Rear: without Not identified
Lock

without Not identified
Racks

without Not identified

Sizes and geometry

6 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 389mm

Stack 575mm

Wheelbase 1021mm

Head angle 72.0°

Seat angle 73.3°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 700c wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	378	375	389	393	407	429
Stackmm	555	552	575	590	610	649
Top tube lengthmm	530	535	550	565	585	625
Seat tube lengthmm	470	420	530	550	580	610
Head tube lengthmm	140	125	160	175	185	230
Head tube angle	72.5°	71°	72°	72.5°	73°	73°
Seat tube angle	74°	74°	73.25°	73.25°	73°	73°
Chainstay lengthmm	430	430	430	430	430	430
Wheelbasemm	1005	1000	1021	1026	1042	1089
Front centermm	586	581	601	606	621	668
Bottom bracket dropmm	72	72	71	70	69	69
Bottom bracket heightmm	277	277	278	279	280	280
Fork rakemm	48	34	42	43	43	56
Trailmm	60	84	69	65	62	48
Stack/reach ratio	1.47	1.47	1.48	1.50	1.50	1.51
Suspension and parts
Crank lengthmm	170	170	172.5	172.5	175	175
Handlebar widthmm	400	400	420	440	440	460
Stem lengthmm	80	70	90	100	110	120

Not published by the manufacturer: Standover height, Front travel, Rear travel, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Steel
Fork material: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 38
Largest chainring: 38
Rear sprockets: 13
Smallest sprocket: 10
Largest sprocket: 48
Lowest gear: 23.0 in
Highest gear: 110.2 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Wheel material: Aluminum
Wheel size: 700c

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

23.0 gear inches

This value is below the central range for this class.

Cohort: Road / Gravel Model year: 2025
Sample: 1,536 bicycles with this information
Coverage: 76.6% of the class

Highest gear

110.2 gear inches

This value is below the central range for this class.

Cohort: Road / Gravel Model year: 2025
Sample: 1,536 bicycles with this information
Coverage: 76.6% of the class

Shifting

Mechanical

688 of 1,999 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2025
Sample: 1,999 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.8 km/h
Highest gear: 42.2 km/h

Total gear range 480%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 23.0–110.2 gear inches
Class reference (p10–p90): 22.8–126.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Gravel Model year: 2025
Lowest gear: 1536 bicycles with this information, 76.6% of the class
Highest gear: 1536 bicycles with this information, 76.6% of the class