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Niner Air 9 2 Star SLX Bike

Item #: BI219A04
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Niner Air 9 2 Star SLX Bike

Niner Air 9 2 Star SLX Bike

When Niner set out to design an aluminum version of their highly praised and World Cup tested Air 9, they didn’t settle for mediocrity when it came to the quality of alloy. Knowing that any sort of compromise in frame material would do injustice to the proven geometry, Niner shaped the Air 9 using high end hydroformed alloy  that benefits from the same decade of refinement and testing as its carbon fiber siblings.

To make Niner’s most economical race-machine both lighter and faster, this upgraded version integrates Niner's hydroformed tubing throughout. More than just a sophisticated technology marketing term, hydroforming allows Niner to shape the tubes for optimized strength and stiffness in key areas, giving the ability to create beautifully tuned frames with precise ride characteristics. You’ll find hydroforming in the top tube, downtube, headtube, chainstays and seatstays, equating to an overall much lighter and stiffer ride feel that promotes more precise steering and  snappier power transfer. The rigid sides of the signature downtube and top tube shapes maximize torsional stiffness, with buttery smooth ride quality achieved through the flat sections on each tube, which act like leaf springs.

The Air 9 features a tapered headtube with an integrated headset. By allowing for the use of the newest generation of 1.5” tapered steerer suspension forks and integrated headset, Niner create the stiffest front end possible – leading to amazing steering precision as you carve a corner and descend toward the finish line. If you find yourself mashing the “I wish I had a little bit more travel” button, like a genie in a lamp, Niner designed the new Air 9 to accommodate forks with up to 120mm of travel. Wish granted.

Employing a Pressfit 30 standard bottom bracket, the Air 9 perfectly mates its larger aluminum down tube with the larger BB shell to further optimize power efficiency, while allowing lighter, stiffer cranksets to be used. The new version of the Air 9 features a 12 x 142 rear drop out spacing with Maxle to maximize rear triangle stiffness, and allow easier maintenance.

The Niner Air 9 SLX Bike features an impressive component spec that is ideal for those looking to inject more mountain biking into their lives. RockShox is well known within the industry for producing high-end suspension components that are easy to setup and use. Therefore, it was only logical that Niner chose to incorporate the RockShox Recon Gold Solo Air fork with one of their leading cross-country race frames. The RockShox Recon Gold fork features 100mm of smooth suspension travel for eating up the trail. The 15mm axle and tapered head tube ensure the front end is stiff, helping maintain excellent steering on technical single track or tight switchbacks.

The Air 9 2 Star’s drivetrain is dominated by Shimano SLX components. Shimano SLX components are built to be absorb the abuse of the trail, while remaining cost effective. The Shimano SLX 10 speed drivetrain provides smooth and accurate every time, ensuring no sloppy shifts occur during the heat of a race. Niner’s own alloy wheelset are hard-wearing yet lightweight, providing a set of legs that will take a beating without anchoring you down. A Niner signature cockpit rounds out this build, making it the perfect blend of quality, weight, strength, and speed.

Niner Air 9 Features:

  • High-end Niner hydroformed alloy
  • Now featuring 12 x 142 spacing
  • With Niner’s RDO carbon fork, is a light integrated off road racing system
  • Niner’s world cup tested racing Geometry
  • Tapered head tube for front end stiffness, strength and steering precision
  • Low profile disc brake mounts
  • Replaceable rear derailleur hanger
  • Clearance for 2.1 tire
  • Improved cable routing is side swing FD compatible
  • New lighter Niner head badge
  • Includes Maxle, headset and seat collar
  • Weight: 1590g (size medium)
Frame Niner Air 9 hydroformed alloy
Fork RockShox Recon Gold Solo Air, 100mm travel, 15mm thru-axle
Rear Shock n/a
Headset 1.5” steerer
Shifters Shimano SLX M670, I-Spec compatible, 10-speed
Front Derailleur Shimano Deore M610 10-speed
Rear Derailleur Shimano XT M786 GS, Shadow Plus, medium cage
Crankset Shimano SLX M675, 38x24t
Bottom Bracket Shimano BB70
Pedals n/a
Chain Shimano HG54, 10-speed
Cassette Shimano HG50, 10-speed, 11-36t
Brakes Shimano Deore M615 hydraulic disc brakes, 180/160mm rotors
Wheelset Niner XC Alloy, 15mm front / 142mm x 12mm rear
Tires Schwalbe Racing Ralph Performance, 29 x 2.25"
Handlebar Niner Flat Top Alloy, 710mm, Red Niner Graphic
Stem NINER Alloy Stem, Red Niner Graphic
Grips Niner Grrrips
Seatpost NINER Alloy Seat Post, 400mm, Red Niner Graphic
Seat Clamp n/a
Saddle Niner Custom with Cr-Mo Rails, Niner Graphic
Intended Use XC, Endurance, Gravel, Trail
Weight 1590 grams (size medium)

Note: Components are subject to change without notice.

Size Small Medium Large Extra Large
A: Seat Tube Length 394mm 419mm 483mm 533mm
B: Effective Top Tube 590mm 607mm 626mm 645mm
C: Stack 612mm 617mm 631mm 651mm
D: Reach 403mm 418mm 433mm 446mm
E: BB Height n/a n/a n/a n/a
F: BB Drop/Rise 54mm 54mm 54mm 54mm
G: Head Tube Length 105mm 110mm 125mm 145mm
H: Head Tube Angle 71° 71° 71° 71°
I: Seat Tube Angle 73° 73° 73° 73°
J: Standover Height 724mm 744mm 796mm 837mm
K: Chainstay Length 439mm 439mm 439mm 439mm
L: Wheelbase 1088mm 1094mm 1114mm 1134mm
5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Aluminum Rocket Ship
I bought the Air 9 on sale at Jenson for a great price. It's my first hardtail in over 10 years. I've been on full suspension XC and Enduro rigs ever since.

The first thing I noticed was the weight. It's light! It's not hard to beat my 30 lb. enduro rig, but still, I was surprised. Secondly, the Jenson gold build made everything so easy. All I had to do was tighten the handlebars on to the stem,insert the seatpost, add pedals, and slide the wheels in place. Ready to roll!

This thing is FAST. Instant transmission of my force into the pedals and the back wheel. Climbs like crazy, but more shocking, it descends pretty well too! The geometry on this is really dialed in. My last XC bike was too race oriented to the point where I was too stretched out and the handling was twitchy. This thing is super stable and loves to get down and dirty.

For this build level, the manufacturer put the money in the right places. The XT Shadow+ rear der. is crisp, action is light. Shadow+ means I can go straight to a narrow-wide single ring up front and not worry about chain drop. The SLX cranks are solid as well. Overall, I can't find anything I don't like about this bike, given the price. If I had a few extra dollars to spend, I'd upgrade the wheels and tires, but that can wait.

PROS: Versatile, Component Spec, Geometry, Value, Lightweight

CONS: Non Tubeless-ready
October 15, 2015
Pittsburgh, PA
Awesome ride awesome service
Great service from Jenson. The bike was just what I wanted. I was once a very avid cyclist but like most work took priority. Now back in the saddle for a slow start up. This is my first 29er and I could not be happier. Bike handles every thing I can throw at it +. Amazing! Great component set up for the price.

PROS: Lightweight, Versatile, Durable
October 12, 2015

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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.