Niner has just released the latest drool-worthy steel hardtail with a bikepacking predisposition. The all new Niner Sir 9 was reengineered from the ground up with a mount-laden Reynolds 853 steel frame that fits 27.5+ or 29er wheels and tires…

Posted by Logan Watts

Today Niner joined the list of bike companies offering a 27.5+/29er steel ‘do-it-all’ hardtail. So how different can it be, really? Well, the all new Niner Sir 9 has a few unique tricks up its sleeve. For one it’s fabricated with the upper echelon of steel cycling tubesets, Reynolds 853 — like one of our other favorite bikes, the RLT 9 Steel. Reynolds claims that the “strength to weight ratio of 853 is close to that of quality titanium”. In addition, the Niner Sir 9 is studded with a plethora of mounts, including two pairs of inner triangle bottle bosses, one pair under the down tube, rack and fender mounts on the rear stays, and a pair of bosses topside for a bolt on top tube bag. There are also two bosses on the underside of the top tube enabling a fully strapless bolt-on frame pack (as shown in a few of these press time photos).

Niner SIR 9, 2017-2018, Bikepacking, 27.5+

  • Niner SIR 9, 2017-2018, Bikepacking, 27.5+
  • Niner SIR 9, 2017-2018, Bikepacking, 27.5+

Other changes to note include a completely new chainstay yoke. To increase strength and stiffness, and to meet international ISO mountain biking standards, Niner created a nearly unified yoke which, according to Niner, “… allowed us to create longer and stronger welds to the bottom bracket.” Hidden inside is a plate that adds to the bike’s overall stiffness.

Niner SIR 9, 2017-2018, Bikepacking, 27.5+

  • Niner SIR 9, 2017-2018, Bikepacking, 27.5+
  • Niner SIR 9, 2017-2018, Bikepacking, 27.5+

KEY FEATURES

  • Reynolds 853 steel provides the supple, comfortable ride this legendary material is known for.
  • Compatible with 29 X 2.4, or 27.5 X 3.0 tires to offer the choice of maximum roll over or ultra traction and stability.
  • Revised geometry is optimized for modern trail riding, long days in the saddle and all around good times.
  • Integrated (bolt-on) bag mounts inside front triangle.
  • Bento box mounts on top tube offer additional storage options within reach.
  • 73mm PF 30 BB shell is geared or singlespeed compatible with the Niner Biocentric 30.
  • 148 X 12 Boost rear spacing.
  • Compatible with 1x (max ring 36t) and 2x (26/36 or bigger) drivetrain systems.
  • Compatible with 2x (26/36 or bigger) drivetrain systems, 34.9 Sideswing front pull front derailleur.

TECH SPECS

  • 73mm PF30 BB shell (adaptors required for BSA type bbs).
  • Compatible with Biocentric 30 for singlespeed use.
  • 30.9 seat post.
  • 31.8 seat collar.
  • 34.9 front derailleur clamp.
  • 1.125” X 1.5” Tapered zero stack head tube, 44mm upper, 56mm lower, cane creek description: ZS44/28.6 ZS56/40.
  • 34.9 Side swing, front pull front derailleur.
  • Post mount disc brake – 180mm max rotor size.
  • All sizes have 2 inner triangle bottle mounts, 1 mount under down tube.
  • Can fit up to a 29×2.4O, or 27.5×3.0 Tire (tire sizes vary by brand, some tires may not fit).
  • Compatible with standard 1x (36t max), 2x and 3x systems.

Niner SIR 9, 2017-2018, Bikepacking, 27.5+

The new Niner SIR 9 was designed around Niner’s [r]evolution Trail Geometry and has a 68° head tube angle, 74° seat tube angle, a 427mm chainstay, and a 55mm BB drop. The Niner SIR 9 is available as a frame only for $1200 or one of nine build kits — five 29er options ranging from 2-Star SLX at $3,000 to 5-Star Eagle X01 Carbon for a cool $6k. As a 27.5+ you can get one of four different builds ranging from 2-Star SLX with Stan’s ZTR Baron wheels and a Reba fork for $3,300, to the 5-Star Eagle build with the same wheels, an Eagle X01 drivetrain and a 120mm Fox Float Factory fork for $5k. We like the looks of the 27.5+ Eagle X01 build and the slightly more affordable 4-Star XT:

Niner SIR 9 27.5+ XT

Niner SIR 9 4-STAR XT STANS – 27.5+ $4,400

  • FORK FOX 34 FLOAT FACTORY FIT4, 3 POSITION W/ ADJ, KASHIMA COAT, 120MM, 110X15MM
  • WHEELS STAN’S NOTUBES NEO/ZTR BARON S1, 110X15MM FRONT, 148 X 12MM REAR
  • TIRES MAXXIS REKON+ DC/EXO/TR 2.8 FRONT & REAR
  • BRAKES & ROTORS SHIMANO XT M8000 ICE TECH PADS, 180/160MM RT86 ICE TECH ROTORS
  • R/ SHIFTER SHIMANO XT M8000 11SP I-SPEC II
  • R / DERAILLEUR SHIMANO XT M8000 GS 11SP SHADOW PLUS
  • CASSETTE SHIMANO XT M8000 11-46T
  • CHAIN SHIMANO XT HG-701 11SP
  • CRANK SET RACE FACE TURBINE 32T
  • BOTTOM BRACKET RACE FACE PF30
  • SADDLE NINER CUSTOM WITH CR-MO RAILS, NINER GRAPHIC
  • SEAT POST KS LEV INTEGRA
  • HANDLEBAR RACE FACE NEXT 760MM WIDE, 20MM RISE, 35MM CLAMP
  • STEM RACE FACE AEFFECT 35MM CLAMP
  • GRIPS NINER GRRRIPS L/O

Niner SIR 9, 2017-2018, Bikepacking, 27.5+

  • TBGR_LOL

    Thanks for the article. I’ve been waiting for news about this bike and figured they would try to make it bikepacker friendly. This looks like a great bike … apart from the press-fit bottom bracket. Why do that, especially on a steel frame?

  • Jake Kruse

    hot damn, this is a great looking bike. if folks were left in the cold by salsa terminating the el mar, this fits the bill and then some.

  • Tiger Funk

    True, except for the press-fit BB – Salsa El Mar for the win. Dear Niner, please thread your BB’s.

  • Jake Kruse

    rather have the threaded bb as well but not a deal breaker for me.

  • Rob Grey

    want. so much. but for those prices i can get local boutique handmades in canadian dollars. still tempted, though

  • Other than manufacturing benefits, some would argue that PF30 offers weight savings, greater bearing durability, clean / narrow q-factor, plus a bigger, stronger crank spindle, and the ability to run a concentric BB for single speed conversion…

  • Warwick

    I get the hate on PF BBs but having had the previous generation of this frame and now an RLT, I can say I’ve not one issue noise or anything with PF in a steel frame (touch wood). With the Sir9 I ran the EBB with a King GXP and never had a complaint over three years, now with the RLT am running a PF30 King and so far same again.

  • Good to hear. I spent a fair amount of time on the RLT 9 Steel (which I loved) and never had a problem. At this point, the only time I would take issue with a PF BB is if 1. the tolerances were out of whack and it made noise all the time; 2. if I were setting out on a big 3+ month trip overseas somewhere it wouldn’t be possible to service…

  • TBGR_LOL

    Yeah but still

  • speedius

    I have last year’s model. 6’4″ 200lbs, no issues with EBB. If you are more cross country oriented, you might be better off with it if you can find it- steeper head tube, comes with headset, $200 cheaper. Shorter chainstays might be nice though.

  • Michael Wood

    Frame weight?

  • Cass Gilbert

    I’m no fan of press fit BBs for long distance/potentially overseas bikepacking. But bear in mind that the frame is compatible with Niner’s threaded EBB insert. Which means you can adjust the BB height dependent on wheel size and tension a chain if your derailleur is damaged. But it’s an extra as a complete bike (comes included with the frame) and you’ll need different cranks than the ones supplied. Opinions are inevitably divided but personally, I really like high quality EBBs, and I’ve heard good things about Niner’s.

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