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Niner Sir 9 3 Star XT 1X Bike

Item #: BI190A00
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Niner Sir 9 3 Star XT 1X Bike

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!

Features

  • 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 
SPECIFICATIONS
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
Rear Shock -
Headset Niner tapered ZS44 top, EC44 bottom
Shifter Shimano XT SL-M8000 I-Spec II mount, 11 speed (right only)
Front Derailleur -
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
Pedals Not Included
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
Seatclamp Niner, 31.8mm
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.


GEOMETRY (mm / inch)
Size Small Medium Large Extra Large
A: Seat Tube Length 393
15.5
419
16.5
483
19.0
546
21.5
B: Effective Top Tube 592
23.3
609
24.0
628
24.7
647
25.5
C: Stack 620
24.4
637
25.1
652
25.7
671
26.4
D: Reach 395
15.6
409
16.1
423
16.7
436
17.2
E: BB Height 0
0.0
0
0.0
0
0.0
0
0.0
F: BB Drop 49
1.9
49
1.9
49
1.9
49
1.9
G: Head Tube Length 100
3.9
110
4.3
125
4.9
145
5.7
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
28.2
736
29.0
790
31.1
842
33.1
K: Chainstay Length 440
17.3
440
17.3
440
17.3
440
17.3
L: Wheelbase 1085
42.7
1096
43.1
1115
43.9
1135
44.7
Suggested Rider Height 160-175 cm
5'3"-5'9"
173-183 cm
5'8"-6'0"
181-191 cm
5'11"-6'3"
191-201cm
6'3"-6'7"
5.0 / 5.0
3 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
3
0
0
0
0
Badass steel rig
Badass bike, they mean it when they say "steal is real"
By far the best handling bike I have ever owned
User submitted image
Badass bike
May 19, 2017
Purchased
4 months ago
Location:
Massachusetts
Awesome
Great build , a work of art , handles well, xc tire setup , weight acceptable for xc racing , quit fast actually
June 21, 2017
Purchased
3 months ago
Location:
Minnesota
Steel is the way.
I'm an avid recreational road cyclist. As a beginner that wants more bike for the money and wanting to avoid upgrades later on the road, I went with this lovely steel hardtail bike. I love the faux titanium finish. It's quite light bike at 25.5 lbs and handles well. I take it to my local trails with heavy roots and rock gardens, and as a beginner with semi okay line choices off road, this bike was quite forgiving. Rear wheel bounces around when powering through rough stuff, but tracks well when gravity takes over. Corners well, comfortable, and crazy fast, I'm just too chicken to go that fast. High end components. Great bike. Just wish that for the price point, a dropper post would have made me even happier about my purchase.
May 25, 2017
Purchased
4 months ago
Location:
Kansas City

Q & A

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 3 questions Browse 3 questions and 5 answers
Is this the new, updated 2017 SIR frame?
A shopper on May 24, 2017
BEST ANSWER: This is the same model as the one currently available on Niner's website as of this writing.
I'm 5'10" - would the Medium be a good fit?
bowser on May 24, 2017
BEST ANSWER: Medium or large depending on standover.
Do the wheels ship set up as tubeless? Or do they come with tubes?
Catherine on May 5, 2017
BEST ANSWER: We ship the bikes with tubes installed., so you'll have to set up the tires tubeless once you receive the bike. Thanks for your question, Keep Pedaling!

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Get free shipping with your $50 purchase today when you choose Standard Shipping at checkout. Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items

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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.