Niner SIR 9 Frameset - Black - Gray The SIR 9 is 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 made from proven, air-hardened, heat treated steel. That's right, steel. Because Steel is Real and it's fully optmized in the SIR 9. Hand welded air hardened Reynolds 853 steel frame and utilizes a 12x148 axle to provide stiffness and comfort in one durable package. Pair with a 120mm fork and up to 29x2.40" tires and you have a bike fit for any trail. Build it geared or single speed using our Single Speed Nut and Biocentric 30 bottom bracket (sold seperately). Each Niner frame is backed by a Lifetime Warranty. Frame comes with Niner seat collar, derailleur hanger, Niner headset, headset spacers, YAWYD top cap and frame build accessory kit.
