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!
| 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.
| 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" |
CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including (Cadmium, Phthalates, Bisphenol, Nickel (Metallic), di(2-ethylhexyl)phthalate "DEHP"), which is known to the State of California to cause cancer and/or cause birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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The Norco Optic and Sight are a couple of the most popular trail and all-mountain bikes available, respectively. New for 2024, Norco has completely updated their suspension platform, moving from a traditional 4-bar design to a high-pivot 4-bar design to increase versatility. No matter how much travel you choose, a high pivot bike will be able to punch above its weight class.
Buying a new bike is often one of the most exciting purchases you will make in a given year. That said, it can also come with a little stress given the myriad of additional gear you'll need to consider to maximize your fun and safety on the trail. From helmets, to pedals, to knee pads and pretty much everything else you can imagine, we've got the gear you need in our warehouses available and ready to ship. In the following list, we'll run through the top items to consider picking up along side your new bike purchase. As always, if you have any questions, feel free to reach out to one of our Gear Advisor pros for assistance.
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There are so many different avenues that you can take to purchase a new bike, so what sets us apart from them? Why buy a bike from us?
Here at Jenson USA, we take great pride in making sure that your bike buying experience is confidence inspiring and trouble-free from start to finish. We want to be absolutely sure that we are providing the best possible service we can to each and every one of our customers so that there are no questions when purchasing a new bike from us!
At Jenson USA, it's important to us to support those who are helping build the community of riders and sharing their experiences with others. To that end, we've built an arsenal of Ambassadors that we help to support.
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CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including (Cadmium, Phthalates, Bisphenol, Nickel (Metallic), di(2-ethylhexyl)phthalate "DEHP"), which is known to the State of California to cause cancer and/or cause birth defects or other reproductive harm. For more information, go to 
