Niner:
steel is real.
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.
Sir 9 2-star SRAM sx eagle specifications
sram does it again with a wallet friendly, high-performing parts kit. Mated to our sir 9 frame and marzocchi suspension, every feature of this adventure-seeking singletrack slayer is fully optimized.
- Niner wheels
- marzocchi bomber z2 fork, 120mm travel
- niner alloy seatpost
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: marzocchi bomber z2 rail, sweep adj, 120mm, 110x15mm, 44mm offset
shock: n/a
tubes / sealant: stans no tubes sealant (2 x 2oz bottles)
front wheel: niner alloy, 110x15mm front, niner graphic
rear wheel: niner alloy, 148x12mm rear, niner graphic
front tire: maxxis minion dhf 3c/exo/tr 2.5 wt front
rear tire: maxxis rekon 3c/exo/tr 2.4 wt rear
brakes: sram level
brake levers: sram level
brake rotors: sram level
chain: sram sx eagle 12sp
front shifter: n/a
rear shifter: sram sx eagle 12sp
front derailleur: n/a
rear derailleur: sram sx eagle 12sp
cassette: sram pg 1210 11-50t
crankset: sram x1 1k eagle dub, 32t
bottom bracket: sram dub 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 aeffect r 780mm 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