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SIR 9

Steel is real.

Made from metal

SIR 9: rugged, reliable, comfortable Reynolds 853 steel

There’s a new bike in town. It’s built to last and not let you down. When you’re spinning up the steeps, bombing down the backcountry and grinding out the final miles as the sun sinks into the horizon, you need a bike you can trust. A comfortable, capable, hand-built bike made from proven, air-hardened, heat-treated steel. That’s right, steel. Because Steel Is Real and it’s fully optimized in the SIR 9.

Yes, SIR

So what’s the story with our steel hardtail? For starters, it’s STEEL. This classic metal alloy from materials icon Reynolds gives us the comfortable, durable, capable, versatile, “ride it hard and put it away wet” frame that we have always wanted.

To make it even more tasty, the SIR 9 is strapped with a 120mm travel FOX suspension fork, perforated with no fewer than 18 threaded, reinforced mounting points, clears 29x2.4” (or 27.5x3.0”) tires, and offers easy options for geared or singlespeed drivetrains. No excuses - pack an extra jacket and a PBR, go farther, and stay out longer.

The SIR 9 is perfect for just about any type of riding, no matter how long or short. It’s a butt-kicking, grin-inducing lunch ride launch pad when you only have 30 minutes to burn in the back lot. It’s also made for multi-day missions in the backcountry. And it’s made to make you happy the minute you throw a leg over it.

Get real with Reynolds 853 steel

This modern metal alloy is well known for its unique properties. It actually strengthens in the tube junctions when it air-cools after welding. So, we can do more with it, yet we actually can use less material. For instance, we can design intricate chainstay and seat-stay yokes to accommodate either 29” or 27.5-Plus wheels and tires, with plenty of mud clearance to spare. We also don’t need to add heavy gussets and tube reinforcements - it’s plenty strong as-is.

“Trail country” geometry

Blurring the lines between modern trail bike geometry and traditional cross-country geometry, the SIR 9 occupies a niche we lovingly call “trail country.” If you’re doing a combination of long pedaling rides, stiff climbs, extended descents, and spicy technical sections, you’ll love what we’ve done here. “Trail country” geometry translates to modern trail manners when you need them most, with no sacrifice of efficiency or agility.

The roomy cockpit has a comfortable reach for short stem lengths, giving you quick handling and plenty of maneuverability to blast through rock gardens and cut hard corners. The steep 74-degree seat angle gets you centered over the BB for climbing and pairs nicely with the short 430mm chainstay length for supreme pedaling efficiency.. And of course, the slack, 68-degree head tube angle and long wheelbase contribute stability and self-confidence when you’re dropping into the steepest lines.

Pack it up, pack it in, let me begin...

The versatility of steel gives us the option to add accessory mounting points, and boy did we ever. There are rack and fender mounts, bottle cage mounts, frame bag mounts, and even a top-tube bento box mount. The rear rack mounts are strong enough to hold 55lbs.

Reynolds 853 steel

The magic air-hardened metal from Reynolds actually strengthens after welding.Read More

Multiple mounting options

No fewer than 18 mounting points give you the freedom to run racks, fenders, bottles, frame bags, a bento box, and more. Read More

Biocentric 30

Do you yearn for simplicity? Our patented BioCentric bottom bracket system gives you the freedom to easily go single-speed or geared. Read More

Trail ready geometry

With a longer top tube and slacker head tube angle, the SIR 9 is stable, trail-specced and ready to get shreddy in all circumstances.

Integrated dropper post routing

Clean and concealed, SIR 9 is ready with ports on the seat tube for internal dropper post cable routing.

Lifetime warranty

Ride, race, rally. We have you covered with warranty service, small parts, and a support team that actually answers the phone.Read More

Tire clearance

Need room to roam? We got it. The SIR 9 has clearance to run your choice of 29er or 27.5+ wheels and tires.

"New trends in geometry and componentry are inspiring some really fun bikes, even for those who don't consider themselves the hardtail type."

"Niner has just released the latest drool-worthy steel hardtail with a bikepacking predisposition."

"It's still steel and 29in, but the new SIR 9 from Niner has a whole load more versatility built into it."

"The latest SIR 9 is an attractive option for riders who want a classic material in an up-to-date, versatile package."

SIR 9

$1,499.00 $1,199.00
In stock
Only %1 left
SKU
SIR-9
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SIR 9 3-STAR SRAM GX EAGLE Specifications

Expect the best from our fan favorite 3-Star SRAM GX Eagle kit. Mated to the SIR 9 frame and FOX 34 Float Factory suspension, every feature of this adventure-seeking singletrack slayer is fully optimized.

  • DT Swiss M 1900 SPLINE wheels
  • FOX 34 SC Float Factory EVOL FIT4, 3 position, 120mm, 110X15mm, 44mm offset
  • KS LEV SI dropper post
Available frame sizes SM, MD, LG, XL Available colors Black/Bronze
Frame HAND WELDED AIR HARDENED REYNOLDS 853 STEEL; EXTERNAL CABLE ROUTING; INTEGRATED BOTTLE, BAG, RACK AND FENDER MOUNTS; 12X148 THRU AXLE Fork FOX 34 SC FLOAT FACTORY EVOL FIT4, 3 POSITION W/ ADJ, KASHIMA COAT, 120MM, 110X15MM, 44MM OFFSET
Shock N/A Rims/Wheels DT Swiss M 1900 SPLINE, aluminum clincher, 30mm internal
Hubs DT Swiss 370 Centerlock, with Ratchet System 36 LN Spokes DT Champion straight pull
Front Tire SCHWALBE NOBBY NIC EVO SUPER TRAIL TLE ADDIX SPEEDGRIP 2.6 Rear tire SCHWALBE NOBBY NIC EVO SUPER TRAIL TLE ADDIX SPEEDGRIP 2.35
Tubes / Sealant STANS NO TUBES SEALANT (2 X 2oz BOTTLES) Brakes SRAM G2 R
Brake levers SRAM G2 R Brake rotors 180/160 CENTERLINE ROTORS
Rear shifter SRAM GX EAGLE 12SP Front shifter N/A
Rear derailleur SRAM GX EAGLE 12SP Front derailleur N/A
Cassette SRAM EAGLE XG 1275, 10-52T Chain SRAM GX EAGLE 12SP
Crankset SRAM DESCENDANT 7K EAGLE DUB, 32T (S/M/L - 170MM, XL - 175MM) Bottom bracket SRAM DUB PF30
Saddle NINER CUSTOM WITH CR-MO RAILS, EMBOSSED NINER GRAPHIC Seatpost KS LEV SI (XS/S-100MM, M/L/XL-150MM)
Handlebar RACE FACE AEFFECT R 780MM WIDE, 20MM RISE, 35MM CLAMP Stem RACE FACE AEFFECT R 40MM, 35MM CLAMP
Headset NINER INTERNAL ZS SHIS DESCRIPTION ZS44/28.6|ZS56/40 Grips NINER GRRRIPS L/O NYLON SOFT COMPOUND

We make every effort to publish accurate build specs, however Niner Bikes reserves the right to make substitutions or changes to bike assembly specification at any time without notice or warning. Product images may not reflect actual specification. Minor variance in color may be visible including fork decal color. Published approximate weights are for size medium (53cm) and may vary by +/- 15% due to manufacturing tolerances.

GEOMETRY CHART
TECHNICAL SPECIFICATIONS
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