Author A-Matrix 24D

Name: Author A-Matrix 24D
Brand: Author

2026 YouthRoad youth Manufacturer page

Fork travel: 50 mm
Wheels: 24″
Drivetrain: 1 × 8 32t / 11–34t
Gear range: 309%
Weight: 11.5 kg 25.4 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

12" 125–140

Components

9 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 24" Not identified

Suspension

1 part

Fork
- Zoom

Drivetrain

5 parts

Cassette
- Shimano CS-HG31-8 8 speeds
CS-HG31
Chain
- KMC Z8.3 8 speeds
Crankset
- Prowheel
Rear derailleur
- Shimano Tourney TX RD-TX800 8 speeds
RD-TX800
Shifters
- Shimano Acera

Brakes

1 part

Brakes
- Tektro HD-J2820
HD-J2820

Wheels and tires

5 parts

Front hub

QUANDO Disc, 28 holes Not identified
Rear hub

QUANDO Disc, 28 holes Not identified
Rims

alloy, 28 holes Not identified
Spokes

black stainless steel 1.8 mm Not identified
Tires
- Kenda Aptor

Cockpit and contact points

5 parts

Handlebar

alloy, rise 20 mm, 580 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

Enter your height to highlight matching ranges.

Size 12"

Table

Reach 345mm

Stack 494mm

Wheelbase 956mm

Head angle 70.0°

Seat angle 73.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 24″ 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	345
Stackmm	494
Top tube lengthmm	492
Seat tube lengthmm	318
Head tube lengthmm	100
Head tube angle	70°
Seat tube angle	73.5°
Chainstay lengthmm	395
Wheelbasemm	956
Front centermm	562
Bottom bracket dropmm	20
Fork rakemm	42
Stack/reach ratio	1.43

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
Bicycle weight: 11.5 kg

25.4 lb

Suspension

Suspension configuration: Hardtail
Front travel: 50 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 8
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 22.6 in
Highest gear: 69.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 1.95″
Wheel material: Aluminum
Wheel size: 24″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.7 km/h
Highest gear: 26.7 km/h

Total gear range 309%

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: 22.6–69.8 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 2026 builds

Differences across 2026 builds
Specification	This bicycle Author A-Matrix 24D	Author A-Matrix 24	Author A-Matrix 26	Author A-Matrix 26D	Author A-Matrix 27.5D	Author A-Matrix 29D
Frame
Bicycle weight	11.5 kg	11.1 kg	11.9 kg	12.2 kg	13.8 kg	14.1 kg
Suspension
Front travel	50 mm	50 mm	80 mm	80 mm	80 mm	80 mm
Drivetrain
Rear sprockets	8	8	8	8	9	9
Largest sprocket	34	34	40	40	46	46
Lowest gear	22.6 in	22.6 in	20.8 in	20.8 in	19.1 in	20.2 in
Highest gear	69.8 in	69.8 in	75.6 in	75.6 in	80.0 in	84.4 in
Brakes
Brake type	Hydraulic disc	Rim brake	Rim brake	Hydraulic disc	Hydraulic disc	Hydraulic disc
Other specifications
Tire width	1.95″	1.95″	1.95″	1.95″	2.1″	2.1″
Wheel size	24″	24″	26″	26″	27.5″	29″
Fork spring	Not informed	Not informed	Not informed	Not informed	Coil	Coil