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Item # NNR0005

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Item # NNR0005

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Description

It can be daunting to undertake the search for a new bike, what with the sheer volume of variation, options, and tech jargon bouncing around websites and forums. Carbon this, forged that … an arm for this, and a leg for that. The Niner S.I.R. 9 is a safe haven from paralysis by analysis. It shares the same custom Reynolds tubeset as the MCR 9 in a stripped-down, single-speed set-up. But, far from locking you into a decision, you’ll be able to set the S.I.R. 9 up with any drivetrain configuration out there, from 2x10 to triples—can you say options?

All you have to do to convert the S.I.R. 9 for use with gears is add a derailleur hanger dropout and swap the EBB for one of Niners CYA press fit adapters. A nice touch on the S.I.R. 9 is its low-profile cable guides that keep the silhouette sleek, even if you’re going gear-free.

The proprietary Reynolds 853 tubing and custom S-bend rear seatstays and chainstays give the S.I.R. 9 a distinctive ride that dedicated cyclists crave—it deadens trail chatter while feeling lively under your input. The tubing wall thicknesses are tweaked both externally and internally to produce the best possible ride quality for each frame size. Clean TIG welds provide the strength, while short chainstays and a steep head angle offer the maneuverability tight, twisty trails require. Niner gave the S.I.R. 9 a radically sloping top tube for stand-over clearance. From the beefy tire clearance to the down tube shaped to avoid interference with fork crowns, everything about this frame shows the design time invested

The S.I.R. 9 features Niner’s exclusive Bio-Centric EBB technology. An essential design element of the Bio-Centric system is that the cups lock to the bottom bracket shell’s flange. Once the EBB is in position, one bolt tightens the eccentric to the flanges, providing 360 degrees of purchase while eliminating any chance for creak-causing dirt or debris to contaminate the interface. Also, because forces are no longer placed against the inside of the shell, it won’t round out or suffer from the over-tightening issues of traditional EBB designs.Niner SIR 9 Detail This simple solution makes the S.I.R. 9 the true Zen-machine SS bikes should be. The wheel can be removed without hassling with caliper position or chain tension, and you’re guaranteed perfect dropout-to-frame alignment—unlike individually adjustable sliding drops.

If you plan on going the geared route, Niner recommends doubles not exceeding 39/26 chainrings for SRAM, and 40/28 for Shimano. A standard triple will pose no problems. The rear triangle will accommodate a 2.4in tire, and you can run a 160mm or smaller rear rotor. The disc mount is International Standard—the frame’s disc specific. You’ll need a bottom pull, top-swing front derailleur with a low-mount 28.6mm clamp. The MCR 9 uses a 27.2mm seatpost, a 73mm BB (only external style BBs works with the EBB), and a standard 1-1/8in external headset.

Niner offers the S.I.R. 9 in two colors: Niner Green and Midnight. Four sizes: Small, Medium, Large and Extra Large ensure there’s a Niner for everyone.

Geometry chart

Niner Bikes

Geometry Chart

 

S.I.R. 9
80mm Fork
 

Seat Tube

(c-t)

Effective Top Tube

(eTT)

Stack

(S)

Reach

(R)

Standover

Head Tube

(HT)

Head Tube Angle

(HTo)

Seat Tube Angle

(STo)

Bottom Bracket Drop

(BBD)

Chainstay

(CS)

Wheelbase
S 15.5in 23.2in 24.2in 15.9in 28.0in 3.9in 70.8o 73.3o 2.2in 17.3in 42.4in
M 16.5in 23.8in 24.5in 16.5in 28.8in 4.3in 71.3o 73.3o 2.2in
17.3in 42.9in
L 19.0in 24.6in 25.4in 17.0in 30.9in 4.9in 71.3o 73.3o 2.2in 17.3in 43.7in
XL 21.5in 25.3in 25.9in 17.6in 32.9in 5.7in 71.3o 73.3o 2.2in 17.3in 44.4in
100mm Fork
 

Seat Tube

(c-t)

Effective Top Tube

(eTT)

Stack

(S)

Reach

(R)

Standover

Head Tube

(HT)

Head Tube Angle

(HTo)

Seat Tube Angle

(STo)

Bottom Bracket Drop

(BBD)

Chainstay

(CS)

Wheelbase
S 15.5in 23.3in 24.4in 15.6in 28.2in 3.9in 69.8o 72.3o 1.9in 17.3in 42.7in
M 16.5in 24.0in 25.1in 16.1in 29.0in 4.3in 70.3o 72.3o 1.9in 17.3in 43.1in
L 19.0in 24.7in 25.7in 16.7in 31.1in 4.9in 70.3o 72.3o 1.9in 17.3in 43.9in
XL 21.5in 25.5in 26.4in 17.2in 33.1in 5.7in 70.3o 72.3o 1.9in 17.3in 44.7in

Niner S.I.R. 9 Geo

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