AIR 9 Aluminum Alloy Hardtail Bike (2024)

AIR 9 Aluminum Alloy Hardtail Bike (1)

Durable, affordable, aluminum

Build your AIR 9

To AIR 9 is human

An aluminum hardtail with the DNA of a trail bike

If a cross-country race bike met a rugged trail bike in the woods, their love child might look a lot like our AIR 9 aluminum hardtail. This bike blends the agility and efficiency of a pedal-friendly XC bike with the versatility, toughness and capability of a rowdy trail rig.

AIR 9 Aluminum Alloy Hardtail Bike (2)

Versatility x durability = maximum fun factor

Let's face it. The AIR 9, Niner's lightweight aluminum hardtail, has always been capable. So how do you make capable even better? For one thing, we keep the excellent qualities of Niner's tried and true, hydroformed aluminum. Lightweight and snappy, poppy and peppy, the AIR 9 has plenty of stiffness to get you up to speed when you stomp on the pedals.

Next, apply our [R]evolution geometry which puts the rider in the sweet, balanced spot on the bike and the ride experience goes up, way up. Then, add Boost 148 spacing because tire and wheel options are a good thing. Top it off with internal routing for a dropper post and you've made one capable bike even more capable.

Run it geared. Run it singlespeed. Comfortable enough for all day riding and quick enough to pin it at the races, the new AIR 9 handles what you throw at it. Genetically engineered? Maybe not. But it sure is fun to ride.

AIR 9 Aluminum Alloy Hardtail Bike (3)

Not just any old aluminum

This modern metal alloy is tried and true. We’ve been working with aluminum and other alloys for more than a decade, and we’re proud of our know-how. The resulting hydroformed AIR 9 frame makes the most of the material properties to blend stiffness and comfort in a durable package.

Fitted with a 120mm fork and with room for oversized, 29x2.4” (or 27.5x3.0”) tires, this bike is fit for any trail. It’s optimized for modern trail riding, long days in the saddle, and all around good times.

AIR 9 Aluminum Alloy Hardtail Bike (4)

“Trail country” geometry

Blurring the lines between modern trail bike geometry and traditional cross-country geometry, the AIR 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 co*ckpit 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.

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Tire clearance

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

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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

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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

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Protection where you need it

We use the smoothest, most durable pivot bearings in the industry. Made by Enduro, they’re built for life.

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Hydroformed aluminum frame

Welded, hydroformed aluminum yields a strong, lightweight frame with tube shapes for optimized ride quality.

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$749.00 $399.00

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AIR-9

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AIR 9 2-STAR SRAM SX EAGLE Specifications

Hit the trail on our 2-Star SRAM SX build kit, without a hit to your wallet. Thanks to SRAM’s outstanding SX Eagle drivetrain, we can bring every ounce of AIR 9 performance to an affordable price level.

  • Marzocchi Bomber Z2 Rail suspension fork, 120mm
  • Race Face bar and stem
  • SRAM SX Eagle drivetrain
Available frame sizes XS, SM, MD, LG, XL Available colors Slate Blue/Cement Grey
Frame NINER HYDROFORMED AND WELDED 6061-T6 ALUMINUM Fork MARZOCCHI BOMBER Z2 RAIL, SWEEP ADJ, 120MM, 110X15MM, 44MM OFFSET
Shock N/A Front Wheel Niner Alloy, aluminum clincher, 30mm internal width, 110x15mm, 6-bolt
Rear Wheel Niner Alloy, aluminum clincher, 30mm internal width, 148x12mm, 6-bolt Hubs Niner Boost, 6-bolt
TUBES / SEALANT STANS NO TUBES SEALANT (2 X 2oz BOTTLES) 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 Brakes SRAM LEVEL
Brake levers SRAM LEVEL Brake rotors 180/160MM SRAM G2CS ROTORS
Chain SRAM NX EAGLE 12SP Front shifter N/A
Rear shifter SRAM SX EAGLE 12SP Front derailleur N/A
Rear derailleur SRAM SX EAGLE 12SP Cassette SRAM PG1210 11-50T
Crankset SRAM X1 1K EAGLE DUB, 32T (XS/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
Approximate weight 25.0 lbs

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.

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TECHNICAL SPECIFICATIONS

AIR 9 Aluminum Alloy Hardtail Bike (11)

AIR 9 Aluminum Alloy Hardtail Bike (2024)
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