2019 Niner
SIR 9 - 3-Star GX Eagle - 27.5+
A 27.5″ / 29″ steel frame hardtail trail bike with high-end components.
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| MSRP | $4,050 |
|---|---|
| Weight | 26.5 lbs |
| Frame | Steel |
| Suspension | Hardtail, 120mm |
| Fork | Fox Factory Float 34 |
| Wheels | 27.5″ / 29″ Aluminum |
| Drivetrain | 1 × 12 |
| Groupset | GX Eagle, Truvativ Descendant |
| Brakes | Hydraulic Disc |
| Seatpost | Dropper |
For This Bike
5'2" – 5'8"
5'6" – 5'11"
5'10" – 6'3"
6'1" – 6'7"
🐐 Estimated
None yet.
Do you have this bike? Help other riders make a decision about which size will work for them by sharing your own size and fit notes.
Jul 2020 · McCoy
Keepin’ it real with steel
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
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 | Reynolds 853 air hardened steel, welded BB Standard: PF30, 73mm, Press Fit Tire Clearance: 2.4" |
|---|---|
| Fork | FOX 34 SC FLOAT FACTORY FIT4 EVOL, 3 POSITION W/ ADJ, KASHIMA COAT, 120MM, 110X15MM, 51MM OFFSET Travel: 120mm Spring Type: Air |
| Shock | N/A Spring Type: Air |
| Bottom Bracket | 73mm PF30 BB Shell (Adapters Required For BSA Type BBs); compatible with Biocentric 30 BB |
| Headset | NINER INTERNAL ZS SHIS DESCRIPTION ZS44/28.6|ZS56/40 |
| Stem | RACE FACE AEFFECT R 40MM, 35MM CLAMP |
| Handlebar | RACE FACE AEFFECT R 780MM WIDE, 20MM RISE, 35MM CLAMP |
| Saddle | NINER CUSTOM TR WITH CR-MO RAILS, PRINTED NINER GRAPHIC |
| Seatpost | KS LEV SI Type: Dropper |
| Grips | NINER GRRRIPS L/O NYLON FLANGED |
| Rear Derailleur | SRAM GX EAGLE 12SP |
|---|---|
| Front Derailleur | N/A |
| Crank | SRAM DESCENDANT 7K EAGLE DUB 32T |
| Shifters | SRAM GX EAGLE 12SP |
| Cassette | SRAM EAGLE XG 1275, 10-50T |
| Chain | SRAM GX EAGLE 12SP |
| Brakes | SRAM GUIDE R Type: Hydraulic Disc |
| Brake Levers | SRAM GUIDE R |
| Rims | Front: STANS NOTUBES ARCH S1 29 or BARON S1 27.5+, NEO HUB 110X15MM, Rear: STANS NOTUBES ARCH S1 29 or BARON S1 27.5+, NEO HUB 148X12MM REAR |
|---|---|
| Tires | Front: MAXXIS MINION DHF 3C/EXO/TR 29x2.5 or REKON+ DC/EXO/TR 27.5x2.8, Rear: MAXXIS REKON 3C/EXO/TR 29x2.4 WT or REKON+ DC/EXO/TR 27.5x2.8 |
| Disc Rotors | 180/160MM SRAM G2CS ROTORS |
Last updated April 9
Not listed for 1,831 days