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Niner Air 9 RDO 4-Star X01 Complete Mountain Bike - 2014

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Item # NNR0056

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Item # NNR0056


Niner built the Air 9 RDO 4-Star X01 Complete Mountain Bike for those who dream of wiping the floor with their buddies on race day. Furthering this, the stiff, lightweight Air 9 RDO frame received a FOX Racing Shox fork, Stan's NoTubes wheels, and the all-new SRAM X01 11-speed drivetrain. Not only is the build kit race-worthy, but it's trust-worthy as well. So, you have no excuses on race day, but you won't be needing them anyway.

Niner has extensive experience building in carbon fiber, and the Air 9 RDO puts the best of its construction on display. Starting with the Air 9 Carbon platform, the shape of each tube was designed to achieve the lightest possible weight. And this came in both the form of decreased tube diameters, a smaller bottom bracket shell, and slimmed brake mounts. The resulting changes cut over 200 grams over the already lightweight Air 9 Carbon. Furthermore, every aspect of the RDO's carbon layup was optimized in orderto remove every gram of unnecessary material. And despite its feathery weight, Niner is so confident in the strength of the Air 9 RDO that it backs it with a full five year warranty.

At 1125 grams for the size medium frame, saying that the Air 9 RDO is light is like saying that a blue whale is just 'a pretty big animal.' It wasn't long ago that elite-level road racing frames were in that weight range, yet Niner hits this mark with a bike that's stiff at the pedals, and inspires confidence when you're pushing your limits. The 9x135mm QR rear means that finding replacements or upgrades is a piece of cake -- not that you'll need to upgrade, but it's always nice to have options. The PF30 bottom bracket shell enables the use of oversized cranksets for added stiffness. Better yet, it's backwards compatible with almost any style of crankset that you'd want to ride. You'll find a 31.6mm seatpost, which means you'll also have your pick of dropper posts, if you're so inclined. Mounting a front derailleur is a simplified affair using a standard 34.9mm clamp. And for the headset, the IS42 top cup and IS52 bottom cup ensure compatibility with the latest generation of tapered forks.

With the competitive focus of the Air 9 RDO, it only makes sense to build it with components that perform at the highest level. And with the new SRAM X01 drivetrain, you'll get exactly that. Building on the foundation of the venerable XX1 eleven-speed drivetrain, X01 features the same 10/42t XD cassette for a massive gear range with a single chainring upfront. You'll enjoy flawless shifts and chain retention with the clutch derailleur and alternating narrow-wide tooth profile on the chainring. Stopping duties are handled by SRAM's four piston Elixir 9 Trail brakes, which deliver exceptional of power with equally impressive modulation. Suspension duties are handled by a FOX Racing Shox 32 FLOAT FIT CTD fork with 100mm of travel. The fork's sealed damper provides consistent control on long descents, and the tapered steerer tube and 15mm QR thru-axle keep you on your line. Meanwhile, Niner selected Stan's NoTubes Arch EXs for the wheels. Why? Well, because they're light, strong, and wide enough to support today's larger tires, like the Schwalbe tires that are included. And rounding out the build are Niner's own alloy handlebar, alloy stem, and carbon seatpost.

The Niner AIR 9 4 Star Complete Mountain Bike is available in four sizes, from Small to X-Large, and in the color Arctic White.

Tech Specs

Frame Material:
carbon fiber
Front Travel:
100 mm
1.125 - 1.5 in IS42 top cup | IS52 bottom cup
Rear Derailleur:
32 t SRAM X01
Bottom Bracket:
SRAM PressFit 30
10 - 42 t
SRAM PC-1170
[front] 180 mm, [rear] 160 mm
Niner Flat Top Alloy
Handlebar Width:
780 mm
Niner Grrrips
Niner Alloy
WTB Volt Race
Niner Carbon
Stan's NoTubes 3.30/ZTR Arch EX
[front] Schwalbe Rapid Rob EVO TL, [rear] Schwalbe Racing Ralph EVO TL
Tire Size:
[front] 29 x 2.4 in, [rear] 29 x 2.25 in
not included
Recommended Use:
cross country
Manufacturer Warranty:
5 years on frame

sizing chart

Bike size by rider height


Geometry chart

Fuji Bicycles


Geometry Chart


Altamira LTD

Seat Tube


Effective Top Tube








Head Tube


Head Tube Angle


Seat Tube Angle


Bottom Bracket Drop


Chainstay Length



44 44.0cm 51.5cm


36.3cm 72.1cm


72.0 deg 75.0 deg 6.9cm 40.5cm 97.1cm
47 47.0cm 53.0cm


37.0cm 74.1cm 13.0cm 72.5 deg 74.5 deg 6.9cm 40.5cm 97.7cm
50 50.0cm 54.5cm 54.0cm 37.0cm 76.0cm 14.0cm 73.0 deg 73.5 deg 6.9cm 40.5cm 97.6cm
53 53.0cm 56.0cm 56.0cm 37.9cm 78.3cm 16.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 98.6cm
55 55.0cm 57.5cm 58.0cm 38.9cm 80.1cm 18.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 100.1cm
58 58.0cm 59.0cm 60.1cm 39.7cm 82.1cm 20.0cm 74.0 deg 73.5 deg 6.9cm 40.5cm


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  • Familiarity:I've put it through the wringer

i recently had the pleasure of riding this bike for several hours and I must say I was very impressed with it. The RDO stands for Race Day Optimized and it has one goal-to get you across the finish line first! i found the bike handled extremely well over varied terrain. It definitely excels in out of the saddle climbing as it has a stiff bottom bracket giving the bike an unmistakable feeling of surging forward with every stroke of the pedal. It also felt very grounded when decending and i was able to really let it go as the balanced geometry gave me a very confident experience. The bike is very comfortable too which sometimes is the downfall of a stiff hardtail. I rode the bike for 3+ hours and did not feel beat up when i got off of it. All in all this bike is a steal for this price. If you are looking to up your game with one of the fastest,most comfy hardtails on the market, the Air 9 RDO is definitely the bike for you.

If you have specific questions about the bike I would be happy to answer them. I can be reached at: or 801-736-6396x4074

Avg. ride time: 8m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Race Day Optimized

  • Familiarity:I've put it through the wringer

As we all know, the carbon 29er hardtail is the fastest race machine you can buy for most types of offroad racing. Niner has taken their famous Air 9 Carbon a step further and created the ?Race Day Optimized? model for those of us that want the fastest of the fast.

Of the 3 carbon 29? hardtails( Trek Superfly, Santa Cruz Highball, and this bike) I?ve owned lately, I?d have to describe the Niner Air 9 RDO as the quickest handling and most nimble-perfectly suited for the east coast and those tight twisty trails everywhere. It doesn?t have that sluggish 29er feels plaguing most 29ers and quickly responds to any input from the pilot. I also have to say the green is one of the best colors I?ve ever seen on a bike.

The X01 build is a solid package for exceptional price. This is a package bike from Niner so we can?t make changes here, but we do have frames I can help custom build your dream bike if you?d prefer.