Niner Sir 9 3 Star XT 1X Bike
Steel is Real. You Feel?
No bike demonstrates "steel is real" quite as clearly as the SIR 9. SIR even stands for "Steel is Real"! With lighter materials such as carbon and aluminum dominating the market, steel bikes remain as relevant and desirable today as they were 50 years ago. Niner proves that heartily with the SIR 9.
With that said, we must realize that all steel is NOT created equal. The Niner SIR tubing is a custom selected set that utilizes high quality tube options for each application within the frame. The front triangle is comprised of Reynolds 853 DZB (Double Zone Butting) tubing which is heat-treated to give high strength and damage resistance, while achieving the steel properties that allow thin walls to be used, so that lighter, yet still fatigue-resistant lines can be built.
Niner's strategic and witty material selection and placement allows the downtube to attach lower on the headtube, reducing front end torsional flex and increasing steering precision. The superior strength of the Reynolds 853 DZB downtube combined with a butting profile in the rest of the tubes, maintains a lively ride quality that keeps the weight impressively low for a steel frame.
Like the rest of Niner's bikes, the SIR 9 utilizes their tried and true geometry along with plenty of keen features to bridge the gap between classic simplicity and modern diligence. The spirit of single speed riding was a strong influence in the design of the SIR 9. Ditching the gears and running single speed is super easy thanks to the included BioCentric II bottom bracket system. Biocentric makes chain tension adjustment easy across a wide range of gears and eliminates the need for adjustable dropouts, allowing you to lock your preferred setting in place without having to re-adjust every time you decide to pull out the wheel or switch from geared mode. It achieves this by offsetting the bottom bracket spindle 8.5mm from the center, offering greater range of adjustment compared to a more traditional EBB setup.
Beyond the frame, we're really stoked on the component selection on this bike. It's truly dialed out of the box. The wide-range Shimano XT 11 speed drivetrain with a Race Face Turbine crankset is a handsome and befitting group to complement the no-nonsense frame. SIR 9 rolls on Stan's Arch EX wheels wrapped in tubeless-ready Maxxis Ikon tires. A Rockshox Reba Boost fork is ready to soak up the trail chatter with 100mm of smooth air travel up front, and tying it all together is the carbon Niner cockpit. There's really not much to complain about here!
Some other trinkets to take note of is the 44mm headtube that allows either a tapered or standard 1 1/8" straight steertube fork. Not to mention, the handsome head badge and stunning paint finish is enough to make you swoon. Steel has never been this real!
- Custom engineered Reynolds 853 steel tubeset with custom-shaped, double-butted Reynolds 853 DZB main tubes delivers a lively ride that gobbles up trail vibration without sacrificing stiffness where it counts
- 44mm Reynolds 631 head tube allows use of modern tapered or old-school 1-1/8" forks
- Niner BioCentric II Bottom bracket system and removable down tube cable stops allows clean singlespeed or geared setup
- Shimano XT 1x11 drivetrain provides a wide gear range in a simple, bulletproof setup
|Frame||SIR 9 Custom engineered steel tubeset for ideal function and ride quality|
|Fork||Rockshox Reba RL Solo Air 29"/27.5" Boost fork, 100mm travel, 15x110mm , tapered|
|Headset||Niner tapered ZS44 top, EC44 bottom|
|Shifter||Shimano XT SL-M8000 I-Spec II mount, 11 speed (right only)|
|Rear Derailleur||Shimano XT RD-M8000 GS 11 Speed|
|Crankset||Race Face Turbine with 32T Direct Mount Cinch Ring|
|Bottom Bracket||Niner PF30 BioCentric II / Race Face BSA 30mm BB|
|Chain||Shimano XT 11 Speed|
|Cassette||Shimano XT CS-M8000 11-46T|
|Brakes||Shimano XT, 6 Bolt Ice-Tech Rotors, 180mm front, 160mm Rear|
|Wheelset||Stan's No Tubes Neo/ZTR Arch EX, 110x15mm front, 142x12mm rear|
|Tires||Maxxis Ikon 3C/EXO/Tubeless Ready 2.35" (f) 2.20" (r)|
|Handlebar||Niner Flat Top Carbon 700mm width|
|Stem||Niner RDO Alloy|
|Grips||Niner Grips, Lock-On|
|Seatpost||Niner Carbon, 400mm, 27.2 diameter|
|Saddle||Niner Custom w/ cr-mo rails|
|Intended Use||XC, Trail|
|Weight||11.59 kg / 25.55 lbs, Medium|
Note: Components are subject to change without notice.
|A: Seat Tube Length||393 |
|B: Effective Top Tube||592 |
|C: Stack||620 |
|D: Reach||395 |
|E: BB Height||0 |
|F: BB Drop||49 |
|G: Head Tube Length||100 |
|H: Head Tube Angle||69.8 °||70.3 °||70.3 °||70.3 °|
|I: Seat Tube Angle||72.3 °||72.3 °||72.3 °||72.3 °|
|J: Standover Height||716 |
|K: Chainstay Length||440 |
|L: Wheelbase||1085 |
|Suggested Rider Height||160-175 cm |
|173-183 cm |
|181-191 cm |
By far the best handling bike I have ever owned
6 months ago
5 months ago
7 months ago
Q & A
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