Author Ronin SL

2025 RoadGravel Manufacturer page

Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 12 42t / 10–51t
Gear range: 510%
Weight: 10.1 kg 22.3 lb · Reference configuration not specified
Frame: Steel
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

50cm 160–170
52cm 168–178
54cm 176–188
56cm 186–195
58cm 193–205

Components

16 of 17 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.

Frame and fork

1 part

Frame

triple butted cromoly REYNOLDS, max tyre size 700 × 40C / 27.5 × 47 Not identified

Suspension

1 part

Fork
- Author

Drivetrain

5 parts

Cassette
- Shimano SLX CS-M7100-12 12 speeds
CS-M7100-12
Chain
- KMC
Crankset
- Shimano GRX FC-RX820 12 speeds
FC-RX820
Rear derailleur
- Shimano GRX RD-RX822 12 speeds
RD-RX822
Shifters
- Shimano GRX ST-RX610
ST-RX610

Brakes

1 part

Brakes
- Shimano GRX BR-RX400
BR-RX400

Wheels and tires

5 parts

Cockpit and contact points

4 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 54cm

Table

Reach 386mm

Stack 587mm

Wheelbase 1037mm

Head angle 71.0°

Seat angle 73.5°

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 5 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	378	382	386	395	397
Stackmm	548	569	587	607	628
Top tube lengthmm	530	545	560	580	595
Seat tube lengthmm	500	520	540	560	580
Head tube lengthmm	120	140	160	180	200
Head tube angle	70.5°	71°	71°	71.5°	72°
Seat tube angle	74.5°	74°	73.5°	73°	72.5°
Chainstay lengthmm	425	425	425	425	425
Wheelbasemm	1020	1026	1037	1047	1051
Front centermm	605	611	621	631	635
Bottom bracket dropmm	70	70	69	68	68
Bottom bracket heightmm	279	279	280	281	281
Fork rakemm	50	50	50	50	50
Trailmm	71	67	67	65	61
Stack/reach ratio	1.45	1.49	1.52	1.54	1.58
Suspension and parts
Crank lengthmm	172	172	175	175	175
Handlebar widthmm	440	440	440	440	460
Stem lengthmm	70	70	90	90	90

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
Bicycle weight: 10.1 kg

22.3 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 42
Largest chainring: 42
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 23.9 in
Highest gear: 121.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 40c
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

23.9 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

121.8 gear inches

This value is within 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: 9.1 km/h
Highest gear: 46.7 km/h

Total gear range 510%

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: 23.9–121.8 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

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2025 builds
Specification	This bicycle Author Ronin SL	Author Ronin
Frame
Fork material	Carbon	Steel
Bicycle weight	10.1 kg	11.9 kg
Drivetrain
Front chainrings	1	2
Smallest chainring	42	30
Largest chainring	42	46
Rear sprockets	12	10
Smallest sprocket	10	11
Largest sprocket	51	34
Lowest gear	23.9 in	25.6 in
Highest gear	121.8 in	121.3 in
Other specifications
Tire width	40c	38c

Changes since 2024
Specification	2024 Author Ronin SL	This bicycle Author Ronin SL
Frame
Bicycle weight	10.2 kg	10.1 kg
Drivetrain
Front chainrings	2	1
Smallest chainring	30	42
Largest chainring	46	42
Rear sprockets	11	12
Smallest sprocket	11	10
Largest sprocket	34	51
Lowest gear	25.6 in	23.9 in
Highest gear	121.3 in	121.8 in
Other specifications
Tire width	38c	40c