Niner AIR 9 SX

Name: Niner AIR 9 SX
Brand: Niner

2026 MountainTrail Manufacturer page

Last known price: $2,199

Prices shown first for United States
Fork travel: 120 mm
Wheels: 27.5″
Drivetrain: 1 × 12 32t / 11–50t
Gear range: 455%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

Fork Travel (MM) Not informed
XS Not informed
SM 160–175
MD 173–183
LG 180–191
XL 191–201

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

NINER HYDROFORMED AND WELDED 6061-T6 ALUMINUM Not identified

Suspension

2 parts

Fork

RAIDON 34X BOOST 29", 120mm, 15X110MM, 51MM OFFSET Not identified
Rear shock

None

Drivetrain

7 parts

Brakes

3 parts

Brake levers
- SRAM Level
Brakes
- SRAM Level
Disc rotors

180/160MM G2CS ROTORS Not identified

Wheels and tires

2 parts

Cockpit and contact points

6 parts

Grips
- Niner
Handlebar
- Niner
Headset
- Niner
Saddle
- Niner
Seatpost
- KS
S-100MMXL-150MM
Stem
- Niner

Sizes and geometry

6 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 425mm

Stack 620mm

Wheelbase 1136mm

Head angle 68.0°

Seat angle 74.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	—	395	410	425	445	465
Stackmm	—	610	610	620	634	652
Top tube lengthmm	—	570	585	603	627	652
Seat tube lengthmm	120	356	394	419	483	533
Head tube lengthmm	120	100	100	110	125	145
Head tube angle	—	68°	68°	68°	68°	68°
Seat tube angle	—	74°	74°	74°	74°	74°
Chainstay lengthmm	—	430	430	430	430	430
Wheelbasemm	—	1102	1117	1136	1162	1189
Front centermm	—	678	693	711	737	764
Bottom bracket dropmm	—	52	52	52	52	52
Bottom bracket heightmm	120	303	303	303	303	303
Standover heightmm	120	698	729	748	800	841
Fork rakemm	—	51	51	51	51	51
Trailmm	—	89	89	89	89	89
Stack/reach ratio	1.00	1.54	1.49	1.46	1.43	1.40

Not published by the manufacturer: 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

Suspension

Suspension configuration: Hardtail
Front travel: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 50
Lowest gear: 17.6 in
Highest gear: 80.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: PF30
Tire clearance: Maximum tire width: 2.4″
Tire width: 2.6″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

4 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

120 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,640 bicycles with this information
Coverage: 96.3% of the class

Lowest gear

17.6 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,227 bicycles with this information
Coverage: 72.0% of the class

Highest gear

80.0 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,227 bicycles with this information
Coverage: 72.0% of the class

Shifting

Mechanical

388 of 1,702 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2026
Sample: 1,702 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.7 km/h
Highest gear: 30.6 km/h

Total gear range 455%

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: 17.6–80.0 gear inches
Class reference (p10–p90): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2026
Lowest gear: 1227 bicycles with this information, 72.0% of the class
Highest gear: 1227 bicycles with this information, 72.0% of the class