Author Cosmic 20

Name: Author Cosmic 20
Brand: Author

2025 YouthGeneral youth Manufacturer page

Suspension: Rigid
Wheels: 20″
Gear range: 200%
Weight: 8.6 kg 19.0 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Rim brake

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

8 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

alloy 6061 20" Not identified

Suspension

1 part

Fork

hi-ten Not identified

Drivetrain

5 parts

Cassette
- Shimano Tourney TZ MF-TZ510-6 6 speeds
MF-TZ510
Chain
- KMC Z6 6 speeds
Crankset
- Prowheel
Rear derailleur
- Shimano Tourney RD-TY200 7 speeds
RD-TY200
Shifters
- Shimano

Brakes

1 part

Brakes
- Tektro

Wheels and tires

5 parts

Front hub

QUANDO, 20 holes Not identified
Rear hub

QUANDO, 20 holes Not identified
Rims

alloy, 20 holes Not identified
Spokes

black steel Not identified
Tires
- Author

Cockpit and contact points

5 parts

Handlebar

alloy, 20 mm, 540 mm Not identified
Pedals

plastic Not identified
Saddle
- Author
Seatpost

alloy (27.2) Not identified
Stem

alloy Not identified

Sizes and geometry

1 size Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 10"

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 1 published size

Complete manufacturer geometry by size
Measurement
Top tube lengthmm	435
Seat tube lengthmm	254
Head tube lengthmm	90
Head tube angle	72°
Seat tube angle	73°
Chainstay lengthmm	360
Wheelbasemm	836
Front centermm	476
Bottom bracket dropmm	10
Fork rakemm	35

Not published by the manufacturer: Reach, Stack, Bottom bracket height, 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
Fork material: Steel
Bicycle weight: 8.6 kg

19.0 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 36
Largest chainring: 36
Smallest sprocket: 14
Largest sprocket: 28
Lowest gear: 25.7 in
Highest gear: 51.4 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 1.75″
Wheel material: Aluminum
Wheel size: 20″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 9.8 km/h
Highest gear: 19.7 km/h

Total gear range 200%

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.