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.
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. 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, 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.
Frame bags by Defiant
Whatever you want to carry, we’ve got you covered. These frame bags are purpose built to get your stuff there and back in style. 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
Trail ready geometry
With a longer top tube and slacker head tube angle, the SIR 9 is stable, trail-specced and ready to get shreddy in all circumstances.
Integrated dropper post routing
Clean and concealed, SIR 9 is ready with ports on the seat tube for internal dropper post cable routing.
Five year warranty
Ride, race, rally. We have you covered with warranty service, small parts, and a support team that actually answers the phone. Read More
Tire clearance
Need room to roam? We got it. The SIR 9 has clearance to run your choice of 29er or 27.5+ wheels and tires.
Specifications
Premium parts and a reliable frame will give you smiles for miles. With 120mm of premium FOX suspension and Stan’s ARCH CB7 wheels, riding so far and so hard was never so easy.
- Stan’s NoTubes ARCH CB7 rims with Neo Ultimate hubs
- FOX 34 SC Float Factory FIT 4 EVOL fork w/Kashima coat, 120mm travel
- KS LEV Integra dropper post
- SRAM X01 Eagle drivetrain
- SRAM Guide RSC brakes
| Available frame sizes | S, M, L, XL | Available colors | Slate blue/orange |
| Frame | Reynolds 853 air hardened steel, welded | Fork | FOX 34 SC FLOAT FACTORY FIT4 EVOL, 3 POSITION W/ ADJ, KASHIMA COAT, 120MM, 110X15MM, 51MM OFFSET |
| Shock | N/A | Tubes / Sealant | STANS NO TUBES SEALANT (2 X 2oz BOTTLES) |
| Front wheel | STANS NOTUBES ARCH CB7 29er, NEO ULTIMATE HUB 110X15MM FRONT | Rear wheel | STANS NOTUBES ARCH CB7 29er, NEO ULTIMATE HUB 148X12MM REAR |
| Front Tire | MAXXIS MINION DHF 3C/EXO/TR 29x2.5 WT FRONT | Rear tire | MAXXIS REKON 3C/EXO/TR 29x2.4 WT REAR |
| Brakes | SRAM GUIDE RSC | Brake levers | SRAM GUIDE RSC |
| Brake rotors | 180/160 SRAM CENTERLINE ROTORS | Chain | SRAM X01 EAGLE 12SP |
| Front shifter | N/A | Rear shifter | SRAM X01 EAGLE 12SP |
| Front derailleur | N/A | Rear derailleur | SRAM X01 EAGLE 12SP |
| Cassette | SRAM EAGLE XG 1295, 10-50T | Crankset | SRAM X1 EAGLE CARBON DUB 32T CNC RING |
| Bottom bracket | SRAM DUB PF30 | Saddle | NINER CUSTOM TR WITH CRN-TI RAILS, PRINTED NINER GRAPHIC |
| Seatpost | KS LEV INTEGRA | 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 | 27.3lbs / 11.6kg** |
This SIR 9 is dressed for success with a light, stiff FOX 34 120mm travel suspension fork, SRAM X01 Eagle drivetrain, and Stan’s Arch or Baron wheels, depending on your choice of wheel size. No excuses - get out and ride!
- Stan’s NoTubes Arch S1 (29er) or Baron S1 (27.5 Plus) wheels
- FOX 34 SC Float Factory FIT 4 EVOL fork w/Kashima coat, 160mm travel
- KS LEV Integra dropper post
- SRAM X01 Eagle drivetrain
- SRAM Guide RSC brakes
| Available frame sizes | S, M, L, XL | Available colors | Slate blue/orange |
| Frame | Reynolds 853 air hardened steel, welded | Fork | FOX 34 SC FLOAT FACTORY FIT4 EVOL, 3 POSITION W/ ADJ, KASHIMA COAT, 120MM, 110X15MM, 51MM OFFSET |
| Shock | N/A | Tubes / Sealant | STANS NO TUBES SEALANT (2 X 2oz BOTTLES) |
| Front wheel | STANS NOTUBES ARCH S1 29 or BARON S1 27.5+, NEO HUB 110X15MM | Rear wheel | STANS NOTUBES ARCH S1 29 or BARON S1 27.5+, NEO HUB 148X12MM REAR |
| Front Tire | MAXXIS MINION DHF 3C/EXO/TR 29x2.5 or REKON+ DC/EXO/TR 27.5x2.8 | Rear tire | MAXXIS REKON 3C/EXO/TR 29x2.4 WT or REKON+ DC/EXO/TR 27.5x2.8 |
| Brakes | SRAM GUIDE RSC | Brake levers | SRAM GUIDE RSC |
| Brake rotors | 180/160 SRAM CENTERLINE ROTORS | Chain | SRAM X01 EAGLE 12SP |
| Front shifter | N/A | Rear shifter | SRAM X01 EAGLE 12SP |
| Front derailleur | N/A | Rear derailleur | SRAM X01 EAGLE 12SP |
| Cassette | SRAM EAGLE XG 1295, 10-50T | Crankset | SRAM X1 EAGLE CARBON DUB 32T CNC RING |
| Bottom bracket | SRAM X1 EAGLE CARBON DUB 32T CNC RING | Saddle | NINER CUSTOM TR WITH CRN-TI RAILS, PRINTED NINER GRAPHIC |
| Seatpost | KS LEV INTEGRA | 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 | 27.4lbs / 11.6kg** |
Expect the best from SRAM’s GX Eagle drivetrain. Mated to our SIR 9 frame and FOX 34 Factory suspension, every feature of this adventure-seeking singletrack slayer is fully optimized.
- Stan’s NoTubes Flow S1 (29er) or Baron S1 (27.5 Plus) wheels
- FOX 34 SC Float Factory FIT 4 EVOL fork w/Kashima coat, 120mm travel
- KS LEV Integra seatpost
- SRAM GX Eagle 1x12 drivetrain
- SRAM Guide RSC brakes
| Available frame sizes | S, M, L, XL | Available colors | Slate blue/orange |
| Frame | Reynolds 853 air hardened steel, welded | Fork | FOX 34 SC FLOAT FACTORY FIT4 EVOL, 3 POSITION W/ ADJ, KASHIMA COAT, 120MM, 110X15MM, 51MM OFFSET |
| Shock | N/A | Tubes / Sealant | STANS NO TUBES SEALANT (2 X 2oz BOTTLES) |
| Front wheel | STANS NOTUBES ARCH S1 29 or BARON S1 27.5+, NEO HUB 110X15MM | Rear wheel | STANS NOTUBES ARCH S1 29 or BARON S1 27.5+, NEO HUB 148X12MM REAR |
| Front Tire | MAXXIS MINION DHF 3C/EXO/TR 29x2.5 or REKON+ DC/EXO/TR 27.5x2.8 | Rear tire | MAXXIS REKON 3C/EXO/TR 29x2.4 WT or REKON+ DC/EXO/TR 27.5x2.8 |
| Brakes | SRAM GUIDE R | Brake levers | SRAM GUIDE R |
| Brake rotors | 180/160MM SRAM G2CS 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, 10-50T | Crankset | SRAM DESCENDANT 7K EAGLE DUB 32T |
| Bottom bracket | SRAM DUB PF30 | Saddle | NINER CUSTOM TR WITH CR-MO RAILS, PRINTED NINER GRAPHIC |
| Seatpost | KS LEV SI | 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 FLANGED | Approximate weight | 28.2lbs / 12kg |
Hit the trail as hard as you can, minus the hit to your wallet. Thanks to SRAM’s outstanding NX Eagle drivetrain, we can bring every ounce of SIR 9 performance to an affordable price level.
- Rockshox Judy Gold RL Solo Air suspension fork, 120mm
- Race Face bar and stem
- SRAM NX Eagle drivetrain
- SRAM Level brakes
- Niner alloy wheels, Boost spacing, 29 or 27.5+.
| Available frame sizes | S, M, L, XL | Available colors | Slate blue/orange |
| Frame | Reynolds 853 air hardened steel, welded | Fork | ROCKSHOX JUDY GOLD RL SOLO AIR, 120MM, 110X15MM, 51MM OFFSET |
| Shock | N/A | Tubes / Sealant | STANS NO TUBES SEALANT (2 X 2oz BOTTLES) |
| Front wheel | NINER ALLOY, 29 or 27.5+, 110X15MM FRONT, NINER GRAPHIC | Rear wheel | NINER ALLOY, 29 or 27.5+,148X12MM REAR, NINER GRAPHIC |
| Front Tire | MAXXIS MINION DHF 3C/EXO/TR 29x2.5 or REKON+ DC/EXO/TR 27.5x2.8 | Rear tire | MAXXIS REKON 3C/EXO/TR 29x2.4 WT or REKON+ DC/EXO/TR 27.5x2.8 |
| Brakes | SRAM LEVEL | Brake levers | SRAM LEVEL |
| Brake rotors | 180/160MM SRAM G2CS ROTORS | Chain | SRAM NX EAGLE 12SP |
| Front shifter | N/A | Rear shifter | SRAM NX EAGLE 12SP |
| Front derailleur | N/A | Rear derailleur | SRAM NX EAGLE 12SP |
| Cassette | SRAM PG 1230 11-50T | Crankset | SRAM NX EAGLE DUB 32T |
| Bottom bracket | SRAM DUB PF30 | Saddle | NINER CUSTOM TR WITH CR-MO RAILS, PRINTED NINER GRAPHIC |
| Seatpost | NINER ALLOY SEAT POST, 370MM, NINER GRAPHIC | 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 FLANGED | Approximate weight | 29.9lbs / 12.7kg** |
Build it your way with the SIR 9 frame-only option. The Reynolds 853 steel frame is ready for the best parts you can hang on it. Nearly any drivetrain you can imagine is within reach, and Boost hub spacing gives you freedom for all the wheel and tire options you could want.
- Reynolds 853 steel, can fit 29x2.4” or 27.5x3.0” tires.
- Seatpost size 30.9 (34.9 seat collar)
- BioCentric 30 compatible
- 1.125 x 1.5” zero stack headset (ZS44/28.6 ZS56/40)
- 73mm PF30 BB shell
| Available frame sizes | S, M, L, XL | Available colors | Slate blue/orange |
| Frame | Reynolds 853 air hardened steel, welded |
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