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Niner AIR 9 RDO 4-Star Bike 2021

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If you’re looking for the lightest mountain bike possible, you’ll want to get a hardtail. Hardtails feature suspension on the front making them excellent climbers and fast on the flats. The Niner Air 9 RDO 4-Star Bike is lightweight, stiff, efficient, and compliant. It is great for cruising the trails, shredding the singletrack, and getting riders to the podium. It has an RDO carbon fiber frame that has internal cable routing and is single-speed compatible. The frame features integrated frame protection and tire clearance for up to 2.4″ tires.

The 4-Star version of the Niner Air 9 RDO comes with a Shimano XT M8100 drivetrain. This includes a cassette that has a hill-crushing 10-51T gear range that makes climbing and pedaling through rough terrain much easier. Shimano XT M8100 hydraulic disc brakes provide superior stopping power so you can descend with confidence. With the DT Swiss XR 1700 Spline 25 wheels and Schwalbe tires, you’ll be able to set everything up tubeless for a smoother ride, better traction, and fewer flats.


  • RDO carbon frame with internal cable routing, tire clearance for 2.4″ tires, and integrated frame protection
  • Shimano XT drivetrain provides crisp and reliable shifting in demanding terrain
  • Shimano XT hydraulic disc brakes offer superior stopping power
  • Tubeless-ready rims and tires for a smoother ride, better traction, and fewer flats
  • Fox 32 Step-Cast Float Factory suspension provides 100mm of smooth suspension
Frame RDO Carbon
Fork Fox 32 SC Float Factory EVOL FIT4, 100mm Travel
Rear Shock
Headset Niner Integrated IS42/IS52
Shifters Shimano XT M8100, I-Spec EV
Front Derailleur
Rear Derailleur Shimano XT M8100 SGS
Crankset Race Face Next R Carbon, 32T
Bottom Bracket Race Face PF30
Chain Shimano XT M8100 w/Quicklink
Cassette Shimano XT M8100, 10-51T
Brakes Shimano XT M8100, Metal Pads w/ Fin
Wheelset DT Swiss XR 1700 Spline 25, Boost Hubs
Tires Schwalbe Racing Ray 2.35″ / Racing Ralph 2.35″
Handlebar Niner Flat Top RDO, 780mm
Stem Niner RDO Stem
Grips/Bar Tape Niner Grrrips L/O Soft Compound
Seatpost Niner RDO Seat Post, 400mm
Seatclamp Single-Bolt
Saddle Niner Custom w/ CRN-Ti Rails
Intended Use XC, Trail
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