NINER Jet 9 RDO 4-Star XT 27.5+

As with most bikes in the current trail generation, the key element influencing the new Jet 9's versatile geometry is its Boost rear axle. Bumping the spacing up to 148mm lets Niner chop 21mm off of chainstays by slamming the rear wheel up into the seat tube. The extra clearance also allows for 3in tires on 27.5 rims, which equates to more traction across root-latticed trails and some extra cushion when the terrain gets chunky. The steeper seat tube keeps you centered over the pedals for more efficient climbing while the included dropper post allows you to clear out some cockpit space so you can throw the bike around on descents.

The 27.5+ Jet 9 also includes a deeper fork, running 140mm instead of the 29er model's 130. This keeps the geometry relatively in line across wheel sizes, though the 27.5+ version does shed an extra half degree in the head tube to move the 27.5+ Jet 9 that much closer to enduro rowdiness. It also pairs nicely with the new iteration's longer reach and shorter stem, making for a bike that can ride roughshod across all manner of trail furniture without sacrificing responsive steering. Slack head tubes are fun, but we're occasionally frustrated by their muddy responsiveness. The Jet 9 lives up to Niner's reputation of nimble, big-wheeled machines by applying that ethos to the mid-wheel range and ensuring that enduro aggression doesn't come at the cost of control. We like rolling roughshod over terrain, but we also like the challenge of dicing rock gardens apart. The Jet 9 satisfies that craving.

Despite the above changes, Niner's Race Day Optimized (RDO) construction process remains relatively unchanged. This is a good thing, as Niner's compaction method presses out any excess resin and compacts the carbon down to a uniform wall thickness. This gives Niner precise control over where material placement, letting the engineers reduce weight where it's not needed while ensuring stiffness and durability at key areas of power transfer and abuse.

The CVA suspension model is also virtually unchanged. CVA is designed specifically around 29in wheels to keep the big-rim platform balanced between taut and supple. Since there's little difference in the dimensions between 29 and 27.5+ platforms, it translates well to donut-tire models. CVA's low compression ratio means there's less need for suspension preload, so the mechanism can float more freely and react more readily to the terrain without being loose or sloppy. The lower linkage's placement beneath the bottom bracket isolates pedal input from suspension action to prevent the system from bobbing or back-kicking, resulting in a smooth but efficient ride that's responsive to both your power and the terrain.

The frame's finishing details are everything you'd expect from the obsessive developers at Niner, and our favorite new addition is the inclusion of a BSA threaded bottom bracket. PressFit shells may be lighter and more convenient, but the exact tolerances of a CNC-machined thread are virtually unsurpassable by today's composite technology. The threading means bearing cups install perfectly, reducing wear over time and eliminating the creaks, groans, and pops that so often accompany PressFit models. Vulnerable bits are girded with titanium protection plates. The frame also includes integrated battery storage in case you get the urge for electronic shifting, and the revised axle spacing and geometry dimensions accommodate 29er tires up to 2.5in and 27.5 tires up to 3in

• Very light marking to frame and some components consistent with mininal usage
• Overall in excellent condition with little to no wear throughout

• Frame Model Niner Jet 9 RDO
• Frame Size Medium
• Frame Color Carbon/Red
• Frame Year 2017
• Rear Shock 2017, FLOAT DPS, F-S, K, 3pos-Adj Evol SV, Niner Bikes, JET 9 RDO V2, 7.25, 1.75, 0.2 Spacer, CL, RM, Climb F, Gold Logo
• Headset Niner Cartridge Bearing YAWYD top cap Black
• Spacers (yes/no / xxmm) yes ( 5 x 5mm)niner logo
• Fork Model Description: 2017, 34, K, FLOAT, 29in, F-S, 140, 3Pos-Adj, FIT4, Matte Blk, Gold Logo, 15QRx110, 1.5 T, 51mm Rake, OE
• Fork Travel 140mm
• Front Axle 15mm
• Front Axle Spacing 110mm Boost
• Front Wheel Diameter 27.5"+
• Front Hub DT Swiss 350
• Spoke Holes 28
• Front Spokes Bladed Black
• Front Nipples Enve
• Front Rim Enve Carbon M60/40 Plus White/Grey decals
• Front Tire Maxxis Rekon + EXO TR 27.5 x 2.8
• Front Tube Tubeless
• Front Brake Model Shimano XT BL-M8000/BR-M8000 Black
• Disc Rotor Interface 6-Bolt
• Disc Rotor Model Shimano SM-RT86
• Disc Rotor Diameter 180mm
• Stem Model Raceface Aeffect Black
• Stem Length 50mm
• Stem Steer Tube Diameter 1 1/8"
• Stem Bar Clamp Diameter 35mm
• Handlebar RaceFace Next 35 Carbon 760x20mm 8d Back 5d Up
• Shifters Shimnao SL-M8000 11sp iSpec
• Brake Levers Shimano BL-M8000
• Grips Niner Grrrips Lock-on Black with Niner clamps Black
• Brake Cables Hydraulic
• Shift Cables Jagwire
• Seatpost KS Lev Integra 30.9 x 125mm
• Dropper Routing Internal
• Saddle Niner Logo CrMo Rails
• Front Derailleur N/A
• Derailleur Mount Type N/A
• Bottom Bracket RaceFace
• Crankset RaceFace Turbine 175mm Black
• Chainrings Race Face Narrow Wide 32T Black
• Pedals Not Included
• Chain HG701 11sp
• Cassette Shimnao Xt CS-M8000 11-46 11sp
• Rear Derailleur Shimano XT RD-M8000 11sp
• Derailleur Mount Type Standard
• Rear Axle 12mm through axle
• Rear Axle Spacing 148mm
• Rear Wheel Diameter 27.5"+
• Rear Hub DT Swiss 350
• Spoke Holes 28
• Rear Spokes Bladed Black
• Rear Nipples Enve
• Rear Rim Enve Carbon M60/40 Plus White/Grey decals
• Rear Tire Maxxis Ikon + EXO TR 27.5 x 2.8
• Rear Tube Tubeless
• Rear Brake Model Shimano XT BL-M8000/BR-M8000 Black
• Disc Rotor Interface 6-Bolt
• Disc Rotor Model Shimano SM-RT86
• Disc Rotor Diameter 160mm