Niner SIR 9 4-Star Mountain Bike
- DT Swiss M1900 wheels
- FOX 34 SC Float Factory FIT 4 EVOL fork w/Kashima coat, 120mm travel
- KS LEV Integra dropper post
Made from metal
SIR 9: rugged, reliable, comfortable Reynolds 853 steel
There’s a new bike in town. It’s built to last and not let you down. When you’re spinning up the steeps, bombing down the backcountry and grinding out the final miles as the sun sinks into the horizon, you need a bike you can trust. A comfortable, capable, hand-built bike made from proven, air-hardened, heat-treated steel. That’s right, steel. Because Steel Is Real and it’s fully optimized in the SIR 9.
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. We’ve even got custom frame bags made by Defiant Packs in Carbondale, Colorado. 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, Niner can do more with it, yet we actually can use less material. For instance, Niner designed intricate chainstay and seat-stay yokes to accommodate either 29” or 27.5-Plus wheels and tires, with plenty of mud clearance to spare. Niner also didn'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 Niner 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 Niner the option to add accessory mounting points, and boy did they 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.
|AVAILABLE FRAME SIZES||SM, MD, LG, XL||AVAILABLE COLORS||SLATE BLUE/ORANGE|
|FRAME||HAND WELDED 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||TUBES / SEALANT||STANS NO TUBES SEALANT (2 X 2OZ BOTTLES)|
|FRONT WHEEL||DT SWISS M1900 SPLINE 30, DT370 CENTERLOCK HUB 110X15MM FRONT||REAR WHEEL||DT SWISS M1900 SPLINE 30, DT370 CENTERLOCK HUB 148X12MM REAR|
|FRONT TIRE||MAXXIS MINION DHF 3C/EXO/TR 2.5 WT FRONT||REAR TIRE||MAXXIS REKON 3C/EXO/TR 2.4 WT REAR|
|BRAKES||SHIMANO XT M8100, METAL PAD W/ FIN||BRAKE LEVERS||SHIMANO XT M8100|
|BRAKE ROTORS||180/160 CENTERLINE ROTORS||CHAIN||SHIMANO XT M8100 W/ QUICKLINK|
|FRONT SHIFTER||N/A||REAR SHIFTER||SHIMANO XT M8100 12SP I-SPEC EV|
|FRONT DERAILLEUR||N/A||REAR DERAILLEUR||SHIMANO XT M8100 SGS 12SP|
|CASSETTE||SHIMANO XT M8100 12SP, 10-51T||CRANKSET||RACEFACE NEXT R CARBON 12SP, 32T|
|BOTTOM BRACKET||RACEFACE PF30||SADDLE||NINER CUSTOM TR WITH CRN-TI RAILS, PRINTED NINER GRAPHIC|
|SEATPOST||KS LEV SI (XS/S-100MM, M/L/XL-150MM)||HANDLEBAR||RACE FACE NEXT R 800MM WIDE, 20MM RISE, 35MM CLAMP|
|STEM||RACE FACE TURBINE R 40MM, 35MM CLAMP||HEADSET||NINER INTERNAL ZS SHIS DESCRIPTION ZS44/28.6|ZS56/40|
|GRIPS||NINER GRRRIPS L/O FLANGED||APPROXIMATE WEIGHT|