Author Charisma 55i

Name: Author Charisma 55i
Brand: Author

2026 RoadRace Manufacturer page

Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 34–50t / 11–36t
Gear range: 481%
Weight: 8.5 kg 18.7 lb · Reference configuration not specified
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 160–170
MD 168–178
LG 176–188
XL 186–195

Components

17 of 18 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

AUTHOR carbon Toray T700 monocoque, max tyre size 700 × 35c Not identified

Suspension

1 part

Fork
- Author

Drivetrain

6 parts

Cassette
- Shimano CS-HG710-12 12 speeds
CS-HG710-12
Chain
- Shimano SLX CN-M7100
CN-M7100
Crankset
- Shimano 105
Front derailleur
- Shimano 105 FD-R7150 2 speeds
FD-R7150
Rear derailleur
- Shimano 105 RD-R7150 12 speeds
RD-R7150
Shifters
- Shimano 105

Brakes

1 part

Brakes
- Shimano 105 BR-R7170
BR-R7170

Wheels and tires

5 parts

Cockpit and contact points

4 parts

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 375mm

Stack 574mm

Wheelbase 1003mm

Head angle 72.0°

Seat angle 74.0°

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 4 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	365	375	379	387
Stackmm	558	574	593	619
Top tube lengthmm	525	540	555	570
Seat tube lengthmm	480	500	520	550
Head tube lengthmm	145	160	180	205
Head tube angle	71.5°	72°	72.5°	73°
Seat tube angle	74°	74°	73.5°	73.5°
Chainstay lengthmm	420	420	420	420
Wheelbasemm	993	1003	1009	1020
Front centermm	585	595	600	611
Bottom bracket dropmm	75	75	75	75
Bottom bracket heightmm	261	261	261	261
Fork rakemm	50	50	50	50
Trailmm	60	57	52	49
Stack/reach ratio	1.53	1.53	1.57	1.60

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

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Carbon
Fork material: Carbon
Bicycle weight: 8.5 kg

18.7 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 34
Largest chainring: 50
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 27.4 in
Highest gear: 131.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Electronic

Additional specifications

Tire width: 30c
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

27.4 gear inches

This value is below the central range for this class.

Cohort: Road / Race Model year: 2026
Sample: 720 bicycles with this information
Coverage: 78.6% of the class

Highest gear

131.8 gear inches

This value is within the central range for this class.

Cohort: Road / Race Model year: 2026
Sample: 720 bicycles with this information
Coverage: 78.6% of the class

Shifting

Electronic

632 of 913 bicycles with this information use electronic shifting.

Cohort: Road / Race Model year: 2026
Sample: 913 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 10.5 km/h
Highest gear: 50.5 km/h

Total gear range 481%

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: 27.4–131.8 gear inches
Class reference (p10–p90): 27.4–139.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Race Model year: 2026
Lowest gear: 720 bicycles with this information, 78.6% of the class
Highest gear: 720 bicycles with this information, 78.6% 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 2026 builds
Specification	This bicycle Author Charisma 55i	Author Charisma 55	Author Charisma 66i
Frame
Bicycle weight	8.5 kg	8.9 kg	7.9 kg
Drivetrain
Largest sprocket	36	36	34
Lowest gear	27.4 in	27.4 in	29.0 in
Cockpit
Shifting	Electronic	Mechanical	Electronic
Other specifications
Tire width	30c	30c	28c
Wheel material	Aluminum	Aluminum	Carbon