NINER A.I.R. 9 CARBON

At the heart of Niner’s modus operandi is computer-based finite element analysis combined with heaps of real-world testing. And that testing isn't exclusive to pampered pros. Niner’s computer modeling ninjas don’t drive home in compact cars to mundane lives after a day modeling tube shapes and carbon layups. They shut down the nerd station and throw a leg over prototypes for post-work, seat-of-the-pants beta. From marketing to customer service to their extensive fan base, input from passionate riders is constantly streamed into the Niner development process. It was no different for the Niner A.I.R. 9 Carbon, one of the most sought after, podium-dominating, and versatile 29er chariots money can buy.

Niner’s commitment to development is evident throughout the curvy A.I.R. 9 Carbon, and its foundation is a high modulus carbon fiber structure with optimized weaves, lay ups, and tube shapes. The fluid form is no accident, and is purpose designed to dampen chatter and guide impact forces to stronger parts of the frame. Chain torque goes directly to the rear wheel via the reinforced bottom bracket shell and sturdy chainstays, yet trail vibrations are quelled by the swooping seatstays. From the strength- and precision-enhancing tapered headtube to the internal cable routing and titanium chain-slap protectors, the A.I.R. 9 Carbon checks all the boxes to confidently hold the title of Niner’s top dog.

The A.I.R. 9 Carbon features Niner’s exclusive Bio-Centric EBB technology and CYA Bottom Bracket system. This frees the A.I.R. 9 Carbon from the plethora of new bottom bracket standards, and it means you can easily switch from gears to single speed. Through the use of press-fit inserts, the A.I.R. 9 Carbon can be set up for Shimano or SRAM BB30, Shimano or SRAM BB92, or standard external cups. The options don’t stop there either, the Niner EBB allows you to enjoy pure single speed simplicity without the chain tension headaches.

Eccentric bottom brackets often present finicky maintenance headaches like constant creaking, ovalized shells, and stripped bolts. An essential design element of the Bio-Centric system is that the cups lock to the bottom bracket shell’s flange, providing 360 degrees of purchase while eliminating any chance for creak-causing dirt or debris to contaminate the interface. It won’t round out or suffer from the over-tightening issues of traditional EBB designs. If you’re going the SS route, only external cup bottom brackets will work.

Niner recommends an 80 to 100mm suspension fork, or a rigid unit with a 470mm axle to crown length and 45mm offset. (Perhaps not coincidentally, their award-winning carbon fork shares those exact dimensions). The tapered headtube comes equipped with an FSA IS42/28.6|IS52/40 integrated (Campy style) headset. You’ll need a 31.6mm seatpost and a high-mount, bottom-swing, bottom-pull front derailleur with a 34.9mm clamp. The rear triangle offers clearance for tires up to 2.4in. The A.I.R. 9 stays true to its XC nature in the brake department—160mm rotors are the only option, and the caliper attaches via a post mount. Niner recommends a maximum chainring size of 26/39t SRAM or 28/40t Shimano for2X10 applications to avoid interference issues. Any traditional triple setup will work fine.

Niner dresses the A.I.R. 9 Carbon in three finishes: Black, White, and Tangerine. Size options are Small, Medium, Large, and Extra-Large.

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