Author Aura XR4

2019 RoadGravel Manufacturer page

Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 10 34–50t / 11–34t
Gear range: 455%
Weight: 10.4 kg 22.9 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Mechanical disc

Rider height by size (cm)

Size guide

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

Components

13 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

triple butted alloy 6061 Not identified

Suspension

1 part

Fork
- Author

Drivetrain

6 parts

Cassette
- Shimano CS-HG500-10 10 speeds
CS-HG500-10
Chain
- KMC X10 10 speeds
Crankset
- Shimano Tiagra
Front derailleur
- Shimano Tiagra
Rear derailleur
- Shimano Tiagra
Shifters
- Shimano Tiagra

Brakes

1 part

Brakes

REVER MCX2 disc mechanical (160 mm rotors) Not identified

Wheels and tires

5 parts

Front hub

QUANDO Road Disc 12 x 100 mm thru front axle 32 holes Not identified
Rear hub

QUANDO Road Disc 12 x 100 mm thru front axle 32 holes Not identified
Rims
- Jalco
Spokes

black stainless steel 2.0 mm Not identified
Tires
- Ritchey

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 586mm

Wheelbase 1031mm

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
Reachmm	378	382	386	395	397
Stackmm	548	568	586	606	627
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	1014	1020	1031	1042	1046
Front centermm	599	605	616	626	630
Bottom bracket dropmm	70	70	69	68	68
Bottom bracket heightmm	279	279	280	281	281
Fork rakemm	45	45	45	45	45
Trailmm	76	73	73	69	65
Stack/reach ratio	1.45	1.49	1.52	1.53	1.58

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: Aluminum
Fork material: Carbon
Bicycle weight: 10.4 kg

22.9 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 34
Largest chainring: 50
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 29.0 in
Highest gear: 131.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 35c
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

29.0 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2019
Sample: 449 bicycles with this information
Coverage: 89.2% of the class

Highest gear

131.8 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2019
Sample: 449 bicycles with this information
Coverage: 89.2% of the class

Shifting

Mechanical

65 of 503 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2019
Sample: 503 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 11.1 km/h
Highest gear: 50.5 km/h

Total gear range 455%

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: 29.0–131.8 gear inches
Class reference (p10–p90): 24.4–131.8 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Gravel Model year: 2019
Lowest gear: 449 bicycles with this information, 89.2% of the class
Highest gear: 449 bicycles with this information, 89.2% 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 2019 builds

Differences across 2019 builds
Specification	This bicycle Author Aura XR4	Author Aura XR3	Author Aura XR5
Frame
Fork material	Carbon	Aluminum	Carbon
Bicycle weight	10.4 kg	10.9 kg	9.9 kg
Drivetrain
Rear sprockets	10	9	11
Largest sprocket	34	32	34
Lowest gear	29.0 in	30.8 in	29.0 in
Other specifications
Tire width	35c	35c	38c