Niner ROS 9 Mountain Bike Frame - 2016

$899.00

Item # NNR000Q

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Item # NNR000Q

Ride over it all.

Niner has built a devoted following by repeatedly showing the mountain biking world that our preconceived notions about 29-inch wheels are pretty much all wrong. The latest salvo fired in the aforementioned battle is the ROS 9 Mountain Bike Frame, a chromoly steel monster truck that's far from your average wagon-wheeled hardtail. First of all, it's strong, not light. It's built to handle years of abuse under aggressive riders. That's a good thing, because the slack head angle and tight chainstays make it clear that it’s built for going nuts on trail features, instead of chasing KOMs. Niner says it’s the hardtail for riders who don’t like hardtails, but we’re more inclined to call it old-fashioned fun, without the pretense.

The ROS looks a lot like the SIR 9 from which it's descended, but the burly steel tubeset is far better equipped to handle bigger forks and wild riding styles. As a result, the ROS frame weighs in at 6 pounds, so it's no featherweight. But as anyone who’s ever walked back to the trailhead due to a broken frame can tell you, a little extra weight is well worth the peace of mind, especially when you’re jumping that gnarly double for the first time.

A quick glance at the geometry sheet will confirm that the ROS isn’t your average hardtail. Depending on your choice of a 120mm or 140mm fork, you’ll end up with a 68- or 67-degree head angle, respectively. And in the world of 29ers, that's very slack — perfect for going fast. Out back, the chainstays hover around the 16.5-inch mark, with 5mm of fore/aft adjustability courtesy of Niner's BioCentric bottom bracket. That keeps it turning on a dime, and makes full speed manuals a piece of cake. But it doesn't sacrifice stability with its roomy cockpit and low bottom bracket.

A bike this burly isn't much good if you're stuck with flimsy components. That's where the 44mm head tube comes into play — allowing compatibility with tapered forks. The 31.6mm seat tube fits just about every dropper seatpost on the market, and the stealth routing gives you extra options. The dropouts employ a 12x142mm thru axle, enhancing stiffness and security when you're sending it. The bottom bracket shell is oversized, and includes Niner's BioCentric bottom bracket adapter, which is compatible with 73mm threaded bottom brackets. It's eccentric, so you have both geometry adjustment, and super-simple singlespeed setup options. If you prefer a geared setup, you also have the option of running Niner's CYA adapater, which accommodates all of the latest crank standards, including various oversized spindle options. The maximum chainring size varies depending on the position of the BioCentric EBB insert. At the most rearward position, the Niner recommends running no larger than a 32t chainring, and when in the forward position, it will accept a 38t ring. It’ll clear just about every 2.3in tire on the market, and there's clearance for double and triple chainring cranksets. In other words, it'll handle any setup that your riding warrants.

The Niner ROS 9 Mountain Bike Frame is available in four sizes from Small to X-Large and in the colors Forge Grey and Niner Blue.

Tech Specs

Frame Material:
Cro-Moly steel
Suspension:
hardtail
Head Tube Diameter:
44mm
Headset Included:
yes, ZS44 top, 1.5 external lower
Bottom Bracket Type:
Niner Bio-Centric EBB
Cable Routing:
external
Front Derailleur Mount:
high direct-mount
Seatpost Diameter:
31.6 mm
Seat Collar:
35 mm
Rear Axle:
12x142 mm thru-axle
Recommended Use:
all mountain
Manufacturer Warranty:
2 years on frame

sizing chart

Bike size by rider height

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Geometry chart

Niner

Geometry Chart

 

ROS 9
120mm Travel Fork
 

Seat Tube

(c-t)

Effective Top Tube

(eTT)

Stack

(S)

Reach

(R)

Stand Over

Head Tube

(HT)

Head Tube Angle

(HTo)

Seat Tube Angle

(STo)

Bottom Bracket Drop

(BBD)

Chainstay

(CS)

Wheelbase
S 15.5in 22.8in 25in 15.6in 27.9in 3.9in 68o 74o 2.2in 16.8in 43.2in
M 17in 23.4in 25.3in 16.2in 28.7in 4.3in 68o 74o 2.2in 16.8in 43.9in
L 18.5in 24.2in 25.9in 16.8in 30.8in 4.9in 68o 74o 2.2in 16.8in 44.7in
XL 21in 24.9in 26.6in 17.3in 32.8in 5.7in 68o 74o 2.2in 16.8in 45.6in
140mm Travel Fork
 

Seat Tube

(c-t)

Effective Top Tube

(eTT)

Stack

(S)

Reach

(R)

Stand Over

Head Tube

(HT)

Head Tube Angle

(HTo)

Seat Tube Angle

(STo)

Bottom Bracket Drop

(BBD)

Chainstay

(CS)

Wheelbase
S 15.5in 22.9in 24.9in 15.2in 28in 3.9in 67o 73o 1.9in 16.8in 43.5in
M 17in 23.5in 25.2in 15.7in 28.9in 4.3in 67o 73o 1.9in 16.8in 44.2in
L 18.5in 24.3in 25.8in 16.3in 31in 4.9in 67o 73o 1.9in 16.8in 45in
XL 21in 25in 26.5in 16.9in 33in 5.7in 67o 73o 1.9in 16.8in 45.9in

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Unanswered Question

what exactly do I need for my bottom bracket? Do I also need the CYA insert? Or I am okay with just the BB... for example would SRAM GXP TEAM BOTTOM BRACKET work?

What is the recommended fork offset for the Niner ROS9?

Hi Matt,



Niner designed this frame around forks with 120-140 mm of travel and a 46mm offset. Give us a call if you want to order or if you have questions about parts selection.