2018 Niner
SIR 9 27.5+ 4-Star
A 27.5″ steel frame hardtail trail bike with ultra high-end components.
Compare the full range
| MSRP | $4,950 |
|---|---|
| Frame | Steel |
| Suspension | Hardtail, 120mm |
| Fork | Fox Factory Float 34 |
| Wheels | 27.5″ Aluminum |
| Drivetrain | 1 × 12 |
| Groupset | X01, X1 |
| 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.
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 | Chromoly |
|---|---|
| Fork | FOX 34 Factory Float FIT4, Kashima coating, EVOL air canister, 3-position compression adjustment Travel: 120mm Spring Type: Air |
| Shock | N/A Spring Type: Air |
| Bottom Bracket | Pressfit |
| Headset | Niner headset, zero-stack SHIS, ZS44/28.6, ZS56/40 |
| Saddle | Niner Custom TR, carbon-titanium rails, custom Niner graphic |
| Seatpost | KS Lev Integra Type: Dropper |
| Pedals | N/A |
| Rear Derailleur | SRAM Eagle X01, 12-speed |
|---|---|
| Front Derailleur | N/A |
| Crank | SRAM X1 Carbon |
| Shifters | SRAM Eagle X01, 12-speed |
| Cassette | SRAM XG-1295, 10-50 tooth |
| Chain | SRAM X01 Eagle, 12-speed |
| Chain Guide | N/A |
| Brakes | Hydraulic Disc Type: Hydraulic Disc |
| Rims | Stan's NoTubes Neo/ZTR Arch Baron |
|---|---|
| Front Hub | Stan's NoTubes Neo/ZTR Arch Baron, 15mm x 110mm, 12mm x 148mm |
| Rear Hub | Stan's NoTubes Neo/ZTR Arch Baron, 15mm x 110mm, 12mm x 148mm |
| Tires | Maxxis Rekon+ 2.8" EXO, dual compound, tubeless ready |
Last updated April 14
Not listed for 2,190 days