Niner Air 9 RDO Frame 2018

Availability: In Stock
  • Niner RDO Carbon Compaction System the ultimate in lightweight, strength and reliability
  • Niner’s World Cup tested geometry – updated for a modern race fit and improved handling characteristics
  • 27.2 seat post provides rider comfort while the frame maintains uncompromised efficiency
  • Optimized for 100mm forks (also compatible with 120mm forks)
  • Internal cable routing for a clean setup that is Di2 ready


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Completely Redesigned Niner Air 9 RDO Frame 2018

Niner’s history is rooted in the evolution of mountain biking. From the introduction of our first hardtail, we’ve worked tirelessly to push the limits of what people think is possible when it comes to the construction, geometry and handling of premium bicycles. The [R]Evolution that began with the RKT 9 RDO continues with the new Niner Air 9 RDO Frame 2018, Bigger is Still Better, your Big Wheel Crush is now faster and more refined.


The new Niner Air 9 RDO Frame 2018 is a product of the [R]Evolution of our classic twenty-niner hardtail. We’ve learned so much since the early days and applied that knowledge of geometry and materials to meet the ever-changing demands and riding styles of the modern mountain biker. What we’ve created is undoubtedly the best race and high performance hardtail we’ve made to date, one that will give you all the versatility, durability and performance you’ve come to expect from Niner.


The [R]Evolution geometry of the AIR 9 RDO caters to the racer and rider who places a premium on a snappy, race day whip. Following the lead of the redesigned RKT 9 RDO, the new AIR drops the handlebar height to put the rider in the attack position and ready to charge. Lengthening the cockpit and slackening the head angle further lends to that race-ready feel and adds to the razor sharp handling when slashing singletrack at speed. If you’re a rider looking to increase the fun factor, yet still want the lightest, fastest hardtail we offer, the all new Air 9 RDO is now compatible with 120mm travel forks. The 120mm fork will transform the Air 9 RDO from a racetrack taming weapon into a comfortable, all day trail ripping machine by bringing the bars up and shortening the reach to a more neutral position. And out back, the chainstays were shortened up, but not too short making the bike twitchy. Instead they shed 4mm to a targeted 435mm, so you still get lightning fast acceleration without giving up the balanced handling and on-the-fly stability you need in a race day rig.

Niner Air 9 RDO Frame 2018 Technical Specifications

  • BB type: 73Mmm PF30 BB Shell (Adapters Required For BSA Type BBs)
  • Shock size: N/A
  • Shock mounting hardware: N/A
  • Shock sag: N/A
  • Seatpost size: 27.2
  • Seat collar size: 31.8
  • Front derailleur: 34.9 Side Swing, Front Pull Front Derailleur
  • Headset: 1.125″ X 1.5″ Tapered Integrated (Campy Style) Head Tube, Headset Included, Cane Creek Description: IS42/28.6 | IS52/40
  • Bearing specs: N/A
  • Rear wheel spacing: 148 X 12 Rear Spacing
  • Bottle mount location descriptions: All Sizes Have 2 Inner Triangle Bottle Mounts
  • Max tire size: Can Fit Up To A 29 X 2.4 (Tire Sizes Vary By Brand, Some Tires May Not Fit)
  • Chainring configurations: Compatible With Standard 1X, 2X And 3X Systems
  • 1x max chain ring size: 36T
  • Q-Factor: 168mm
  • Max fork travel: 120mm
  • ISCG compatibility: N/A
  • Max rotor size: Post Mount Disc Brake _ 180mm Max Rotor Size
  • Fork offset: Designed Around 51mm Offset
  • Biocentric: Compatible With Biocentric 30

Niner Air 9 RDO Frame 2018 Geometry

Niner Air 9 RDO Frame 2018 Geometry

Additional information

Intended Use

Cross Country


Air 9 Aluminum



Frame Sizes

Extra Small, Medium, Small


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