Niner SIR 9 - 3-STAR SRAM GX Eagle

Name: Niner SIR 9 - 3-STAR SRAM GX Eagle
Brand: Niner

2025 MountainTrail Manufacturer page

Niner SIR 9 - 3-STAR SRAM GX Eagle, color Black / Bronze

Last known price: $4,499

Prices shown first for United States
Fork travel: 120 mm
Wheels: 27.5″
Drivetrain: 1 × 12 32t / 10–52t
Gear range: 520%
Frame: Steel
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

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

Components

17 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

HAND WELDED AIR HARDENED REYNOLDS 853 STEEL; EXTERNAL CABLE ROUTING; INTEGRATED BOTTLE, BAG, RACK AND FENDER MOUNTS; 12X148 THRU AXLE Not identified

Suspension

2 parts

Fork
- Fox 34
Rear shock

None

Drivetrain

7 parts

Brakes

3 parts

Brake levers
- SRAM G2 R
Brakes
- SRAM G2 R
Disc rotors

180/160 CENTERLINE ROTORS Not identified

Wheels and tires

2 parts

Cockpit and contact points

6 parts

Sizes and geometry

5 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 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	—	410	425	445	465
Stackmm	—	611	620	634	652
Top tube lengthmm	—	595	603	627	652
Seat tube lengthmm	120	396	421	485	533
Head tube lengthmm	120	100	110	125	145
Head tube angle	—	68°	68°	68°	68°
Seat tube angle	—	74°	74°	74°	74°
Chainstay lengthmm	—	430	430	430	430
Wheelbasemm	—	1118	1136	1162	1189
Front centermm	—	693	711	737	764
Bottom bracket dropmm	—	52	52	52	52
Bottom bracket heightmm	120	303	303	303	303
Standover heightmm	120	721	739	791	830
Fork rakemm	—	51	51	51	51
Trailmm	—	89	89	89	89
Stack/reach ratio	1.00	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: Steel

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: 10
Largest sprocket: 52
Lowest gear: 16.9 in
Highest gear: 88.0 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
Fork spring: Air
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: 2025
Sample: 1,808 bicycles with this information
Coverage: 97.5% of the class

Lowest gear

16.9 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,382 bicycles with this information
Coverage: 74.5% of the class

Highest gear

88.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,382 bicycles with this information
Coverage: 74.5% of the class

Shifting

Mechanical

387 of 1,847 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,847 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.5 km/h
Highest gear: 33.7 km/h

Total gear range 520%

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: 16.9–88.0 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: 2025
Lowest gear: 1382 bicycles with this information, 74.5% of the class
Highest gear: 1382 bicycles with this information, 74.5% of the class