SIR 9
Out of stock
Made from metal
SIR 9: rugged, reliable, comfortable Reynolds 853 steel
Yes, SIR
So what’s the story with our steel hardtail? For starters, it’s STEEL. This classic metal alloy from materials icon Reynolds gives us the comfortable, durable, capable, versatile, “ride it hard and put it away wet” frame that we have always wanted.
To make it even more tasty, the SIR 9 is strapped with a 120mm travel FOX suspension fork, perforated with no fewer than 18 threaded, reinforced mounting points, clears 29x2.4” (or 27.5x3.0”) tires, and offers easy options for geared or singlespeed drivetrains. No excuses - pack an extra jacket and a PBR, go farther, and stay out longer.
The SIR 9 is perfect for just about any type of riding, no matter how long or short. It’s a butt-kicking, grin-inducing lunch ride launch pad when you only have 30 minutes to burn in the back lot. It’s also made for multi-day missions in the backcountry. And it’s made to make you happy the minute you throw a leg over it.
Get real with Reynolds 853 steel
This modern metal alloy is well known for its unique properties. It actually strengthens in the tube junctions when it air-cools after welding. So, we can do more with it, yet we actually can use less material. For instance, we can design intricate chainstay and seat-stay yokes to accommodate either 29” or 27.5-Plus wheels and tires, with plenty of mud clearance to spare. We also don’t need to add heavy gussets and tube reinforcements - it’s plenty strong as-is.
“Trail country” geometry
Blurring the lines between modern trail bike geometry and traditional cross-country geometry, the SIR 9 occupies a niche we lovingly call “trail country.” If you’re doing a combination of long pedaling rides, stiff climbs, extended descents, and spicy technical sections, you’ll love what we’ve done here. “Trail country” geometry translates to modern trail manners when you need them most, with no sacrifice of efficiency or agility.
The roomy cockpit has a comfortable reach for short stem lengths, giving you quick handling and plenty of maneuverability to blast through rock gardens and cut hard corners. The steep 74-degree seat angle gets you centered over the BB for climbing and pairs nicely with the short 430mm chainstay length for supreme pedaling efficiency.. And of course, the slack, 68-degree head tube angle and long wheelbase contribute stability and self-confidence when you’re dropping into the steepest lines.
Pack it up, pack it in, let me begin...
The versatility of steel gives us the option to add accessory mounting points, and boy did we ever. There are rack and fender mounts, bottle cage mounts, frame bag mounts, and even a top-tube bento box mount. The rear rack mounts are strong enough to hold 55lbs.
Reynolds 853 steel
The magic air-hardened metal from Reynolds actually strengthens after welding.Read More
Multiple mounting options
No fewer than 18 mounting points give you the freedom to run racks, fenders, bottles, frame bags, a bento box, and more. Read More
Biocentric 30
Do you yearn for simplicity? Our patented BioCentric bottom bracket system gives you the freedom to easily go single-speed or geared. Read More
"New trends in geometry and componentry are inspiring some really fun bikes, even for those who don't consider themselves the hardtail type."
"Niner has just released the latest drool-worthy steel hardtail with a bikepacking predisposition."
"It's still steel and 29in, but the new SIR 9 from Niner has a whole load more versatility built into it."
"The latest SIR 9 is an attractive option for riders who want a classic material in an up-to-date, versatile package."
More Information
Available Frame Sizes | SM, MD, LG, XL |
---|---|
Available Colors | Black/Bronze |
Frame | HAND WELDED AIR HARDENED REYNOLDS 853 STEEL; EXTERNAL CABLE ROUTING; INTEGRATED BOTTLE, BAG, RACK AND FENDER MOUNTS; 12X148 THRU AXLE |
Fork | FOX 34 SC FLOAT FACTORY EVOL FIT4, 3 POSITION W/ ADJ, KASHIMA COAT, 120MM, 110X15MM, 44MM OFFSET |
Shock | N/A |
Front Wheel | STANS FLOW S1 NEO CL |
Rear Wheel | STANS FLOW S1 NEO CL |
Front Tire | SCHWALBE NOBBY NIC EVO SUPER TRAIL TLE ADDIX SPEEDGRIP 2.6 |
Rear Tire | SCHWALBE NOBBY NIC EVO SUPER TRAIL TLE ADDIX SPEEDGRIP 2.35 |
Brakes | SRAM G2 R |
Brake Levers | SRAM G2 R |
Brake Rotors | 180/160 CENTERLINE ROTORS |
Chain | SRAM GX EAGLE 12SP |
Front Shifter | N/A |
Rear Shifter | SRAM GX EAGLE 12SP |
Front Derailleur | N/A |
Rear Derailleur | SRAM GX EAGLE 12SP |
Cassette | SRAM EAGLE XG 1275, 10-52T |
Crankset | SRAM DESCENDANT 7K EAGLE DUB, 32T (S/M/L - 170MM, XL - 175MM) |
Bottom Bracket | SRAM DUB PF30 |
Saddle | NINER CUSTOM WITH CR-MO RAILS, EMBOSSED NINER GRAPHIC |
Seatpost | KS LEV SI (XS/S-100MM, M/L/XL-150MM) |
Handlebar | RACE FACE AEFFECT R 780MM WIDE, 20MM RISE, 35MM CLAMP |
Stem | RACE FACE AEFFECT R 40MM, 35MM CLAMP |
Headset | NINER INTERNAL ZS SHIS DESCRIPTION ZS44/28.6|ZS56/40 |
Grips | NINER GRRRIPS L/O NYLON SOFT COMPOUND |
Tech Specs
frame mounts and fittings | 2 Inner Triangle Bottle Mounts, 1 Mount Under Down Tube, 1 on top tube, rack and fender mounts. | Rear suspension travel | n/a |
Maximum front suspension | 120mm | Fork offset | 44mm |
Shock size | n/a | Shock mounting hardware | n/a |
Suggested shock sag | n/a | Seatpost size | 30.9mm |
Seat collar size | 34.9mm | Cable routing | external |
Front derailleur type | 34.9 side swing, front pull | Headset size | 1.125" X 1.5" Tapered Zero Stack Head Tube, 44mm Upper, 56mm Lower, Cane Creek Description: ZS44/28.6 ZS56/40 |
Pivot bearing specs | n/a | Chainring compatibility | Compatible With Standard 1X, 2X And 3X Systems |
Maximum chainring size | 1x max chain ring size: 36T - Boost Chainring Recommended | Q-Factor | 168mm |
ISCG compatibility | no | Bottom bracket type | 73mm PF30 BB Shell (Adapters Required For BSA Type BBs); compatible with Biocentric 30 BB |
Brake mount type | Post mount | Maximum rear rotor size | 180mm |
Rear wheel spacing | Boost 12x148mm | Rear wheel through-axle spec | M12x1.75Px182L |
Front wheel axle spacing | Boost 15x110mm | Front wheel through-axle spec | |
Max tire size | 29x2.4 or 27.5x3.0 Tire (Tire Sizes Vary By Brand, Some Tires May Not Fit) |
Geometry
(A) TT Length | (B) Seat Tube Length | (C) Chainstay Length Actual | (D) Horizontal Chainstay | (E) Front Center | (F) Wheelbase | (G) BB Drop | (H) Headtube Length | (I) Headtube Angle | (J) Seattube Angle | (K) Standover Height | (L) Reach | (M) Stack | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Metric | ||||||||||||||
Fork Travel (MM) | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | |
SM | 595 | 396 | 430 | 427 | 693 | 1118 | 52.0 | 100 | 68.0 | 74.0 | 721 | 410 | 611 | |
MD | 603 | 421 | 430 | 427 | 711 | 1136 | 52.0 | 110 | 68.0 | 74.0 | 739 | 425 | 620 | |
LG | 627 | 485 | 430 | 427 | 737 | 1162 | 52.0 | 125 | 68.0 | 74.0 | 791 | 445 | 634 | |
XL | 652 | 533 | 430 | 427 | 764 | 1189 | 52.0 | 145 | 68.0 | 74.0 | 830 | 465 | 652 | |
Imperial | ||||||||||||||
Fork Travel (MM) | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | |
SM | 23.4 | 15.6 | 16.9 | 16.8 | 27.3 | 44.0 | 2.0 | 3.9 | 68.0 | 74.0 | 28.4 | 16.1 | 24.0 | |
MD | 23.7 | 16.6 | 16.9 | 16.8 | 28.0 | 44.7 | 2.0 | 4.3 | 68.0 | 74.0 | 29.1 | 16.7 | 24.4 | |
LG | 24.7 | 19.1 | 16.9 | 16.8 | 29.0 | 45.7 | 2.0 | 4.9 | 68.0 | 74.0 | 31.1 | 17.5 | 24.9 | |
XL | 25.7 | 21.0 | 16.9 | 16.8 | 30.1 | 46.8 | 2.0 | 5.7 | 68.0 | 74.0 | 32.7 | 18.3 | 25.7 |
Sizing
Frame Size Recommendations by Height
X-SM
5'0"–5'5"
1.53–1.65M
SM
5'3"–5'9"
1.6–1.75M
MED
5'8"–6'0"
1.73–1.83M
LG
5'11"–6'3"
1.8–1.91M
X-LG
6'3"–6'7"
1.91–2.01M
Inseam Sizing
For riders who fall between sizes, we recommend sizing down for a more maneuverable ride or sizing up for more stability.