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Today’s Deals2018 Niner
SIR 9 4-STAR
A 27.5″ steel frame hardtail trail bike with ultra high-end components.
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Manufacturer Price
$4,950| Frame | Steel |
|---|---|
| Suspension | Hardtail, 120mm |
| Fork | Fox Factory Float 34 |
| Wheels | 27.5″ |
| Drivetrain | 1 × 12 |
| Groupset | X01 Eagle, X1 |
| Brakes | SRAM Guide RSC Hydraulic Disc |
| Seatpost | Dropper |
Summary
The Niner SIR 9 is a versatile cross-country bike praised for its durable Reynolds 853 steel frame, modern geometry, and ample bikepacking features. It offers a comfortable and stable ride, with handling that inspires confidence both uphill and downhill. The bike's compatibility with multiple wheel sizes and drivetrain options adds to its appeal for a wide range of riders.
Durable Reynolds 853 steel frame
Modern geometry for confident handling
Ample bikepacking features and mounting options
Compatible with multiple wheel sizes and drivetrains
Comfortable and stable ride quality
Initial feel of 27.5+ wheels as heavy and slow to accelerate
Requires adjustment period for those used to super-light 29er race bikes
73mm PF30 BB shell requires adaptors for BSA type BBs
A lively, modern geometry suited to challenging trails, both up and down.BIKEPACKING.com
It’s a solid, well-built machine that really does make you feel like you can head out for days.
Mountain FlyerNiner’s new shred-ready hardtail can accommodate 29er or 27.5+ wheels.
MTBRFeedback?
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Oct 2018
I have to admit — I am somewhat of a crusty old dude and sometimes resist change until it has been thoroughly tested by others. This being the case, I was a bit doubtful when I first climbed on the Niner SIR 9, a steel hardtail that can run 27.5-plus or 29-inch wheels. The 27.5x 2.80 tires seemed like overkill compared to my super-light 29er race bike, and the thought of riding a bike that wasn’t fully suspended had me questioning my sanity.
Oct 2017 · Cass Gilbert
Like steel hardtails? We test the Niner SIR 9, boasting a modern, slack geometry, room for 27.5+ tires, and a host of bikepacking-friendly details.
Although its gear range is excellent, SRAM XO1 Eagle feels built for racing rather than bikepacking. It’s fiddly to set up and sensitive to cable stretch.
Press fit bottom bracket requires specialist tools that may be hard to find in the backcountry.
While an eccentric insert is available, none of the standard builds include it.
Jun 2017 · Mtbr
News out of the Niner camp today. The Colorado-based bike maker has re-released its original steel classic, the SIR 9, in a redesigned, ready for anything form. - Mtbr.com
| Frame | SIR 9 - SLATE BLUE/ORANGE BB Standard: PF30, Press Fit Tire Clearance: 2.4" |
|---|---|
| Fork | FOX 34 FLOAT FACTORY FIT4, 3 POSITION W/ ADJ, KASHIMA COAT, 120MM, 110X15MM Travel: 120mm Spring Type: Air |
| Shock | N/A |
| Bottom Bracket | SRAM%20PF30 |
| Headset | NINER INTERNAL ZS SHIS DESCRIPTION ZS44/28.6|ZS56/40 |
| Stem | RACE FACE TURBINE BASIC 50MM, 35MM CLAMP |
| Handlebar | RACE FACE SIXC 820MM WIDE, 20MM RISE, 35MM CLAMP |
| Saddle | NINER CUSTOM TR WITH CRN-TI RAILS, PRINTED NINER GRAPHIC |
| Seatpost | KS LEV INTEGRA Type: Dropper |
| Grips | NINER GRRRIPS L/O FLANGED |
| Crank | SRAM X1 EAGLE CARBON GXP 32T CNC RING |
|---|---|
| Shifters | SRAM X01 EAGLE 12SP |
| Cassette | SRAM EAGLE XG 1295, 10-50T |
| Chain | SRAM X01 EAGLE 12SP |
| Brakes | SRAM GUIDE RSC Type: SRAM Guide RSC Hydraulic Disc |
| Brake Levers | SRAM GUIDE RSC |
| Tires | 29" MAXXIS ARDENT DC/EXO/TR 2.4 or 27.5+ MAXXIS REKON+ DC/EXO/TR 2.8 |
|---|
First added March 30
Last updated March 30
Not listed for 2,992 days