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AIR 9 RDO - 3-STAR SRAM GX EAGLE

Elevate your ride - Light and bright, our signature RDO carbon fiber hardtail rules the racecourse.

Lighter and brighter

Our flagship carbon fiber hardtail: AIR 9 RDO

Niner’s purest expression of light, stiff Race Day Optimized carbon fiber rules the racecourse. This efficient yet compliant frame makes the most of carbon’s unique properties to give you the best ride, no matter if you’re gunning for a podium or cruising local singletrack.

Exquisite engineering

Niner's history is rooted in the evolution of mountain biking. From the introduction of our first hardtail more than a decade ago, 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 AIR 9 RDO. Your big wheel obsession is now faster and more refined.

Designed for the ride

he new AIR 9 RDO is our expression of the classic twenty-niner carbon 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. The result? Our best race and high performance hardtail to date. The AIR 9 RDO embodies all the versatility, durability and performance you've come to expect from Niner.

This frame's identity is refreshed with a bold design aesthetic. Continuing the lineage that began with RKT 9 RDO, the strong, overbuilt shapes that define the front triangle are made for stiffness and pedaling efficiency. But to keep the ride smooth, sleek tubes along the length of the cockpit and seatstays are slender and subtly curved. Topping it off, a 27.2mm seatpost offers rearward flex to take the edge of bumps in the trail.

Have it your way

If ultralight simplicity, clean appearance (and a hard workout) are your jam, set up your AIR 9 RDO as a singlespeed. This frame is compatible with our BioCentric 30 bottom bracket system. You can set up your bike with a single cog and chainring, then tension the chain easily with our patented eccentric BB insert. We’ve been purist mountain bikers from the early days of 29-inch wheels and this frame has been one of our most popular for just this reason.

The PF30 bottom bracket shell gives us plenty of options with regard to drivetrain, no matter your preference. And if you run a geared drivetrain, internal cable routing is super sano and easy to maintain. Even better, this frame is ready for the future with ports to use Di2 electronic shifters.

RDO carbon fiber

Carbon fiber is common, but care, quality and attention to detail are not. Niner RDO carbon fiber is a cut above. We start with the best grades of raw carbon layered precisely according to the stress points on the frame structure. In construction, our process employs rigid internal molds and results in tighter, more consistent compaction of the carbon fabric. The result? Increased precision in wall thickness and reduced resin pooling in the final product. We can build more elaborate structures with better ride tuning, increased strength, outstanding durability, and less weight.

RDO carbon fiber

Niner’s premium Race Day Optimized carbon fiber means more strength, higher stiffness, and less weight. Read More

Internal cable routing

Clean internal cable routing for shifter and brake lines through the frame for easy installation and maintenance.

Protection where you need it

Factory installed, integrated frame protection to keep your ride safe from harm, even when you’re in over your head.

"I am not sure what magic Niner worked into the frame, but it manages to be stiff without beating the s@$t out of you."

"Speed is the name of the game when it comes to Niner's Air 9 RDO."

"The superbly efficient suspension platform and climbing capabilities are a sure recipe for speed on the flats and climbs."

"Spoiler alert this purpose-built XC race machine isn't just a bike, it's a trail weapon!"

More Information
Available Frame SizesXS, SM, MD, LG, XL
Available ColorsSatin Carbon/Silver, ULTRAVIOLET/GREY
FrameNINER RDO CARBON FIBER, INTERNAL CABLE ROUTING, PF30 BB, SINGLE-SPEED COMPATIBLE
ForkFOX 32 SC FLOAT FACTORY EVOL FIT4, W/ REMOTE L/O, KASHIMA COAT, 100MM, 110X15MM, 44MM OFFSET
ShockN/A
Front WheelDT Swiss X 1900 SPLINE, aluminum clincher, 25mm internal, 110x12mm, centerlock
Rear WheelDT Swiss X 1900 SPLINE, aluminum clincher, 25mm internal, 148x12mm, centerlock, ratchet system 36 LN
Front TireSCHWALBE RACING RAY EVO SUPER TERRAIN TLE ADDIX SPEEDGRIP 2.35
Rear TireSCHWALBE RACING RALPH EVO SUPER TERRAIN TLE ADDIX SPEED 2.35
BrakesSRAM G2 R
Brake LeversSRAM G2 R
Brake Rotors180/160 CENTERLINE ROTORS
ChainSRAM GX EAGLE 12SP
Front ShifterN/A
Rear ShifterSRAM GX EAGLE 12SP
Front DerailleurN/A
Rear DerailleurSRAM GX EAGLE 12SP
CassetteSRAM EAGLE XG 1275, 10-52T
CranksetSRAM DESCENDANT 7K EAGLE DUB, 32T (XS/S - 170MM, M/L/XL - 175MM)
Bottom BracketSRAM DUB PF30
SaddleNINER CUSTOM WITH CR-MO RAILS, EMBOSSED NINER GRAPHIC
SeatpostNINER CARBON SEAT POST, 400MM, NINER GRAPHIC
HandlebarNINER FLAT TOP RDO, 780MM, NINER GRAPHIC
StemNINER ALLOY STEM, NINER GRAPHIC (XS/S/M- 80MM, L/XL- 90MM)
HeadsetNINER INTEGRATED SHIS DESCRIPTION IS42/28.6|IS52/40
GripsNINER GRRRIPS L/O NYLON SOFT COMPOUND
Tech Specs
FRAME FITTINGS AND MOUNTS ALL SIZES HAVE TWO BOTTLE MOUNTS INSIDE FRONT TRIANGLE; TITANIUM FRAME GUARDS REAR SUSPENSION TRAVEL N/A
MAXIMUM FRONT SUSPENSION 120MM FORK OFFSET 44MM
SHOCK SIZE N/A SHOCK MOUNTING HARDWARE N/A
SUGGESTED SHOCK SAG N/A SEATPOST SIZE 27.2
SEAT COLLAR SIZE 31.8 CABLE ROUTING FULL SLEEVE INTERNAL CABLE ROUTING
FRONT DERAILLEUR 34.9 SIDE SWING, FRONT PULL FRONT DERAILLEUR HEADSET SIZE 1.125" X 1.5" TAPERED INTEGRATED (CAMPY STYLE) HEAD TUBE, HEADSET INCLUDED, CANE CREEK DESCRIPTION: IS42/28.6 | IS52/40
PIVOT BEARING SPECS N/A CHAINRING COMPATIBILITY COMPATIBLE WITH STANDARD 1X, 2X AND 3X SYSTEMS
MAXIMUM CHAINRING SIZE 1X MAX CHAIN RING SIZE: 36T - BOOST CHAINRING RECOMMENDED Q-FACTOR 168MM
ISCG COMPATIBILITY N/A BOTTOM BRACKET TYPE 73MM PF30 BB SHELL (ADAPTERS REQUIRED FOR BSA TYPE BBS)
BIOCENTRIC COMPATIBLE? YES BRAKE MOUNT TYPE POST MOUNT
MAXIMUM REAR ROTOR SIZE 180MM REAR WHEEL SPACING BOOST 148X12MM
REAR WHEEL THROUGH AXLE SPEC M12X1.75PX182L FRONT WHEEL AXLE SPACING BOOST 110X15MM
FRONT WHEEL THROUGH AXLE SPEC MAX TIRE SIZE 29x2.4
Geometry
Geometry Chart
(A) TT Length (B) Seat Tube Length (C) Chainstay Length (D) Horizontal Chainstay (E) Front Center (F) Wheelbase (G) BB Drop (H) Headtube Length (I) Headtube Angle (J) Seattube Angle (K) Standover Height (L) Reach (M) Stack
Metric
Fork Travel (MM) 100mm 120mm - - - 100mm 120mm 100mm 120mm 100mm 120mm - 100mm 120mm 100mm 120mm 100mm 120mm 100mm 120mm 100mm 120mm
XS 575 579 356 435 431 646 634 1074 1074 58 50 95 70.0 69.0 73.0 72.0 677 688 393 380 602 609
SM 590 593 394 435 431 661 659 1090 1090 58 50 100 70.0 69.0 73.0 72.0 714 724 406 394 607 614
MD 610 614 419 435 431 680 680 1110 1110 58 51 110 70.0 69.0 73.0 72.0 737 744 424 411 617 624
LG 630 634 483 435 431 702 700 1131 1131 58 51 120 70.0 69.0 73.0 72.0 786 796 441 428 626 632
XL 650 654 533 435 431 722 721 1151 1151 58 51 130 70.0 69.0 73.0 72.0 832 837 458 445 635 643
Imperial
XS 22.6 22.8 14.0 17.1 17.0 25.4 24.9 42.3 42.3 2.28 2.0 3.7 70.0 69.0 73.0 72.0 26.7 27.1 15.5 15.0 23.7 24.0
SM 23.2 23.3 15.5 17.1 17.0 26.0 25.9 42.9 42.9 2.28 2.0 3.9 70.0 69.0 73.0 72.0 28.1 28.5 16.0 15.5 23.9 24.2
MD 24.0 24.2 16.5 17.1 17.0 26.9 26.8 43.7 43.7 2.28 2.0 4.3 70.0 69.0 73.0 72.0 29.0 29.3 16.7 16.2 24.3 24.6
LG 24.8 25.0 19.0 17.1 17.0 27.6 27.6 44.5 44.5 2.28 2.0 4.7 70.0 69.0 73.0 72.0 31.0 31.3 17.4 16.9 24.6 24.9
XL 25.6 25.7 21.0 17.1 17.0 28.4 28.4 45.3 45.3 2.28 2.0 5.1 70.0 69.0 73.0 72.0 32.8 33.0 18.0 17.5 25.1 25.3
Sizing

Frame Size Recommendations by Height

X-SM

5'0"–5'5"
1.53–1.65M

SM

5'3"–5'9"
1.6–1.75M

MED

5'8"–6'0"
1.73–1.83M

LG

5'11"–6'3"
1.8–1.91M

X-LG

6'3"–6'7"
1.91–2.01M

Inseam Sizing

Bike inseam sizing example chart

For riders who fall between sizes, we recommend sizing down for a more maneuverable ride or sizing up for more stability.