Author Ultrasonic 26

2025 YouthRoad youth Manufacturer page

Suspension: Rigid
Wheels: 26″
Gear range: 436%
Weight: 10.8 kg 23.8 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

13" 130–150

Components

14 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 hydroformed alloy 6061 26" Not identified

Suspension

1 part

Fork

alloy 6061 26" Not identified

Drivetrain

5 parts

Cassette
- Shimano CS-LG400-10 10 speeds
CS-LG400-10
Chain
- KMC XGlide 11 speeds
Crankset
- Prowheel
Rear derailleur
- Shimano Cues RD-U6000 11 speeds
RD-U6000
Shifters
- Shimano Cues SL-U6000
SL-U6000

Brakes

1 part

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

Wheels and tires

5 parts

Front hub
- Author
Rear hub
- Author
Rims
- Author
Spokes

black stainless steel 2.0 mm Not identified
Tires
- Kenda Small Block Eight

Cockpit and contact points

5 parts

Handlebar
- Author
Pedals

plastic Not identified
Saddle
- Author
Seatpost
- Author
Stem
- Author

Sizes and geometry

1 size Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 13"

Table

Reach 385mm

Stack 542mm

Wheelbase 1020mm

Head angle 69.5°

Seat angle 73.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 26″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Reachmm	385
Stackmm	542
Top tube lengthmm	545
Seat tube lengthmm	343
Head tube lengthmm	110
Head tube angle	69.5°
Seat tube angle	73.5°
Chainstay lengthmm	405
Wheelbasemm	1020
Front centermm	617
Bottom bracket dropmm	30
Fork rakemm	73
Stack/reach ratio	1.41

Not published by the manufacturer: Bottom bracket height, Standover height, Trail, 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: Aluminum
Bicycle weight: 10.8 kg

23.8 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Smallest sprocket: 11
Largest sprocket: 48
Lowest gear: 17.3 in
Highest gear: 75.6 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 2.1″
Wheel material: Aluminum
Wheel size: 26″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.6 km/h
Highest gear: 29.0 km/h

Total gear range 436%

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: 17.3–75.6 gear inches

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 Ultrasonic 26	Author Ultrasonic 24	Author Ultrasonic 27.5
Frame
Fork material	Aluminum	Aluminum	Not informed
Bicycle weight	10.8 kg	9.7 kg	12.5 kg
Suspension
Suspension configuration	Rigid	Rigid	Hardtail
Front travel	Not informed	Not informed	80 mm
Drivetrain
Largest sprocket	48	40	50
Lowest gear	17.3 in	19.2 in	17.6 in
Highest gear	75.6 in	69.8 in	80.0 in
Rear sprockets	Not informed	8	Not informed
Brakes
Brake type	Hydraulic disc	Rim brake	Hydraulic disc
Other specifications
Suspension	Rigid	Rigid	Hardtail
Tire width	2.1″	1.95″	2.25″
Wheel size	26″	24″	27.5″
Fork spring	Not informed	Not informed	Air