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Author Ultrasonic 27.5

Fork travel
80 mm
Wheels
27.5″
Drivetrain
1 × 11 32t / 11–51t
Gear range
464%
Weight
11.5 kg 25.4 lb · Reference configuration not specified
Frame
Aluminum
Brakes
Hydraulic disc

Rider height by size (cm)

Size guide
  • 14" 140–158
  • 16" 155–170

Components

16 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

Sizes and geometry

Size explorer

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

Specifications

Frame and fork

Intended fit
  • Unisex
Frame material
  • Aluminum
Bicycle weight
  • 11.5 kg
  • 25.4 lb

Suspension

Suspension configuration
  • Hardtail
Front travel
  • 80 mm

Drivetrain

Derived by Bikelake
Front chainrings
  • 1
Smallest chainring
  • 32
Largest chainring
  • 32
Rear sprockets
  • 11
Smallest sprocket
  • 11
Largest sprocket
  • 51
Lowest gear
  • 17.3 in
Highest gear
  • 80.0 in

Gearing

Estimated speeds at 80 rpm

This bicycle

Lowest gear
6.6 km/h
Highest gear
30.6 km/h

Total gear range 464%

Pedaling rhythm
80rpm
40
60
80
100
120

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 2022 builds

Differences across 2022 builds
Specification This bicycle Author Ultrasonic 27.5 Author Ultrasonic 24
Frame
Bicycle weight 11.5 kg 9.8 kg
Fork material Not informed Aluminum
Suspension
Suspension configuration Hardtail Rigid
Front travel 80 mm Not informed
Drivetrain
Rear sprockets 11 9
Largest sprocket 51 36
Lowest gear 17.3 in 21.3 in
Highest gear 80.0 in 69.8 in
Brakes
Brake type Hydraulic disc Rim brake
Other specifications
Fork spring Air Not informed
Suspension Hardtail Rigid
Tire width 2.25″ 1.95″
Wheel size 27.5″ 24″

No exact Ultrasonic 27.5 publication is available for 2021.

Other models in this family

2 models

Published versions from the same family and model year.

Author Ultrasonic 27.5, by Author

This bicycle

Road youth

Ultrasonic 27.5

  • Weight: 11.5 kg
  • Suspension: 80 mm
  • Wheel size: 27.5″
Author Ultrasonic 24, by Author

Road youth

Ultrasonic 24

Youth / Road youth

  • Weight: 9.8 kg
  • Suspension: Rigid
  • Wheel size: 24″

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