 Niner&#8217;s SIR 9 is a savvy reminder why every great bicycle comes down to three things: good ideas, good workmanship, and good materials. The SIR 9 combines these qualities in a soulful ride that ensures every ride is a great day on your mountain bike. Niner worked with Reynolds to produce a 853 DZB (Double-Zone Butting) steel tubeset that uses multiple wall thicknesses and a Niner-specific down tube bend to maximize strength and torsional rigidity at the head tube-down tube intersection while maintaining adequate clearance between the down tube and front tire, a tricky balance for 29ers often requiring the addition of gussets (and weight). Niner&#8217;s Biocentric II eccentric bottom bracket offers a dramatic range of adjustability and  allows for clean, rock-solid single-speed setups, manual multi-gear swaps without chain length or brake adjustments, and bottom bracket position adjustability for fine-tuning your geometry. The tapered head tube  is stiff and strong to keep the front end tracking true when the trail throws everything it has at you. The rear through-axle provides great power transfer and responsive handling. 

The SIR 9 2-Star SS is straight to the point, giving you exactly the equipment you need and nothing you don&#8217;t. A SRAM S1000 crankset drives a 20-tooth Niner Cogalicious aluminum rear cog for an efficient, quiet, and easily modified drivetrain. The Stan&#8217;s wheelset is stiff and strong and ready for you to experience all the low-weight, high-traction, and flat-resistant advantages of a tubeless setup. Legendary Maxxis Ikon traction keeps you pinned through berms, while powerful SRAM DB5 brakes offer controlled modulation so you can scrub speed into that next switchback. Reignite your purist mountain biker soul on Niner&#8217;s SIR 9.  

2016 Niner SIR 9 2-Star SS

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