Author A-Matrix 29D

Name: Author A-Matrix 29D
Brand: Author

2026 YouthRoad youth Manufacturer page

Fork travel: 80 mm
Wheels: 29″
Drivetrain: 1 × 9 32t / 11–46t
Gear range: 418%
Weight: 14.1 kg 31.1 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

14" 143–160
16" 157–173
18" 166–182

Components

10 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 29" Not identified

Suspension

1 part

Fork
- SR Suntour XCE28

Drivetrain

5 parts

Cassette
- Shimano CS-LG300-9 9 speeds
CS-LG300
Chain
- KMC XGlide 11 speeds
Crankset
- Prowheel
Rear derailleur
- Shimano Cues RD-U4000 9 speeds
RD-U4000
Shifters
- Shimano Cues SL-U4000
SL-U4000

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 1.8 mm Not identified
Tires
- Kenda Aptor

Cockpit and contact points

5 parts

Handlebar

alloy, rise 20 mm, 660mm Not identified
Pedals

plastic Not identified
Saddle
- Author
Seatpost

alloy (27.2) Not identified
Stem

alloy Not identified

Sizes and geometry

3 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 16"

Table

Reach 406mm

Stack 607mm

Wheelbase 1104mm

Head angle 69.0°

Seat angle 74.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 3 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	386	406	426
Stackmm	602	607	611
Top tube lengthmm	559	580	601
Seat tube lengthmm	356	406	457
Head tube lengthmm	95	100	105
Head tube angle	69°	69°	69°
Seat tube angle	74°	74°	74°
Chainstay lengthmm	445	445	445
Wheelbasemm	1081	1104	1125
Front centermm	644	667	688
Bottom bracket dropmm	65	65	65
Fork rakemm	46	46	46
Stack/reach ratio	1.56	1.50	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: 14.1 kg

31.1 lb

Suspension

Suspension configuration: Hardtail
Front travel: 80 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 46
Lowest gear: 20.2 in
Highest gear: 84.4 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Coil
Tire width: 2.1″
Wheel material: Aluminum
Wheel size: 29″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.7 km/h
Highest gear: 32.3 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: 20.2–84.4 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 29D	Author A-Matrix 24	Author A-Matrix 24D	Author A-Matrix 26	Author A-Matrix 26D	Author A-Matrix 27.5D
Frame
Bicycle weight	14.1 kg	11.1 kg	11.5 kg	11.9 kg	12.2 kg	13.8 kg
Suspension
Front travel	80 mm	50 mm	50 mm	80 mm	80 mm	80 mm
Drivetrain
Rear sprockets	9	8	8	8	8	9
Largest sprocket	46	34	34	40	40	46
Lowest gear	20.2 in	22.6 in	22.6 in	20.8 in	20.8 in	19.1 in
Highest gear	84.4 in	69.8 in	69.8 in	75.6 in	75.6 in	80.0 in
Brakes
Brake type	Hydraulic disc	Rim brake	Hydraulic disc	Rim brake	Hydraulic disc	Hydraulic disc
Other specifications
Fork spring	Coil	Not informed	Not informed	Not informed	Not informed	Coil
Tire width	2.1″	1.95″	1.95″	1.95″	1.95″	2.1″
Wheel size	29″	24″	24″	26″	26″	27.5″