Author Sonic 27.5

2023 MountainCross-country Manufacturer page

Fork travel: 80 mm
Wheels: 27.5″
Drivetrain: 1 × 10 32t / 11–46t
Gear range: 418%
Weight: 12.2 kg 26.9 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

14" 140–158
16" 155–173

Components

14 of 19 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 hydroformed alloy 6061 27.5" Not identified

Suspension

1 part

Fork
- RST

Drivetrain

5 parts

Cassette
- Shimano Deore CS-M4100-10 10 speeds
CS-M4100-10
Chain
- KMC X10 10 speeds
Crankset
- Prowheel
Rear derailleur
- Shimano Deore
Shifters
- Shimano Deore

Brakes

1 part

Brakes
- Tektro HD-M275 / HD-M276
HD-M275HD-M276

Wheels and tires

5 parts

Front hub

QUANDO Disc, 32 holes Not identified
Rear hub

QUANDO Disc, 32 holes Not identified
Rims
- Author
Spokes

black stainless steel 2.0 mm Not identified
Tires
- CST

Cockpit and contact points

6 parts

Grips
- Author
Handlebar
- Author
Pedals

resin Not identified
Saddle
- Author
Seatpost
- Author
Stem
- Author

Sizes and geometry

2 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 14"

Table

Geometry diagram unavailable

The drawing needs reach and stack, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 2 published sizes

Complete manufacturer geometry by size
Measurement
Top tube lengthmm	550	575
Seat tube lengthmm	356	406
Head tube lengthmm	110	115
Head tube angle	69°	69.5°
Seat tube angle	74°	73.5°
Chainstay lengthmm	420	420
Wheelbasemm	1052	1067
Front centermm	636	651
Bottom bracket dropmm	45	45
Bottom bracket heightmm	310	310
Fork rakemm	43	43

Not published by the manufacturer: Reach, Stack, Standover height, Trail, Stack/reach ratio, 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
Bicycle weight: 12.2 kg

26.9 lb

Suspension

Suspension configuration: Hardtail
Front travel: 80 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 46
Lowest gear: 19.1 in
Highest gear: 80.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Air
Tire width: 2.25″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

4 measures

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

Front travel

80 mm

This value is below the central range for this class.

Cohort: Mountain / Cross-country Model year: 2023
Sample: 1,907 bicycles with this information
Coverage: 95.2% of the class

Lowest gear

19.1 gear inches

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2023
Sample: 1,578 bicycles with this information
Coverage: 78.8% of the class

Highest gear

80.0 gear inches

This value is below the central range for this class.

Cohort: Mountain / Cross-country Model year: 2023
Sample: 1,578 bicycles with this information
Coverage: 78.8% of the class

Shifting

Mechanical

223 of 2,002 bicycles with this information use electronic shifting.

Cohort: Mountain / Cross-country Model year: 2023
Sample: 2,002 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.3 km/h
Highest gear: 30.6 km/h

Total gear range 418%

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: 19.1–80.0 gear inches
Class reference (p10–p90): 17.7–101.5 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Cross-country Model year: 2023
Lowest gear: 1578 bicycles with this information, 78.8% of the class
Highest gear: 1578 bicycles with this information, 78.8% of the class