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Niner
Air 9 RDO 4-Star X01/RS-1 Complete Mountain Bike - 2016

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Niner's Air 9 RDO 4-Star X01/RS-1 Complete Mountain Bike won't transform you overnight from a baggy shorts noodler into a Lycra-clad rocket; however, if you've already built an explosive fitness level, then the Air 9 RDO's Carbon Compaction System (CCS) layup and X01 one-by drivetrain form an appropriate catalyst to propel you into the XC firmament.


The frame's rocket ship status is a result of Niner's Race Day Optimized (RDO) construction ethos, which removes any impediments to speed. This begins with the CCS construction method mentioned above, Niner's proprietary method of compacting carbon to eliminate any extra material, resin pooling, and imperfections for a virtually perfect frame that's a claimed 100 grams lighter than the previous Air 9. The obsessive reworking of the frame is even evident in such details as the low-profile disc brake mount and the omission of the usual, heavy CYA bottom bracket in favor of a PF30 model.


Despite these changes, though, the Air 9 RDO’s race-proven geometry and tube shapes, designed to dampen chatter and distribute impact forces to the stronger parts of the frame, remain largely unaltered. Chain torque goes directly to the rear wheel via the same large bottom bracket shell and shapely chainstays of previous models, but with the added stiffness of a 12x142mm rear axle. The bike's spine connects the tapered head tube to the oversized bottom bracket via a large down tube to ensure the frame tracks true and responds to every input.


In order to keep your mind off of ancillary concerns and focused on the race, Niner specs this model of the Air 9 RDO with their 4-Star build. A quick glance at the spec sheet suggests that the these are the SRAM X01 drivetrain, the RockShox RS-1 Solo Air fork, Stan's NoTubes ZTR rims mated to SRAM's XO hubs, and Shimano's indefatigable XT M785 brakes.


Frame Material
CCS carbon fiber
Fork
RockShox RS-1 Solo Air
Front Travel
100 mm
Headset
Cane Creek
Shifters
[right only] SRAM X01
Rear Derailleur
SRAM X01
ISCG Tabs
no
Crankset
32 t SRAM X1
Bottom Bracket
SRAM PF30
Cassette
10 - 42 t SRAM XG 1195
Chain
SRAM PC 1170
Brakeset
Shimano XT M785
Brake Type
hydraulic disc
Rotors
180 / 160 mm Shimano XT IceTech RT86
Handlebar
Niner Flat Top Carbon
Handlebar Width
710 mm
Grips
Niner Grrrips
Stem
Niner Alloy
Saddle
Niner Custom with Cr-Mo Rails
Seatpost
Niner Carbon
Wheelset
[rims] Stan's NoTubes ZTR Arch EX
Hubs
SRAM XO
Front Axle
15x100mm thru-axle
Rear Axle
12x142mm thru-axle
Tires
Schwalbe Rapid Rob EVO TL
Tire Size
29 x 2.25 in
Pedals
not included
Recommended Use
cross-country
Manufacturer Warranty
5 years on frame

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