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Note: Photos are for illustration purposes. You will be shipped a complete bike with the specifications listed below.
The Niner SIR 9 demonstrates steel is real! Steel bikes are as relevant today as they were 50 years ago. With that said, all steel is NOT created equal. The Niner SIR tubing is a custom selected set that utilizes the best tube options for each application within the frame. The front triangle is comprised of new Reynolds 853 DZB (Double Zone Butting) tubing. Developed for mountain bikes, more specifically 29ers, Reynolds 853 DZB offers two significant advantages. Historically downtube fork clearance on 29ers has been tricky because of the relatively high head tube to bottom bracket height. A straight downtube needs to be welded high on the back of the headtube to achieve fork clearance, often requiring either a gusset between the headtube and the downtube or a thicker heavier downtube to achieve the desired strength. The Reynolds 853 DZB tube overcomes this limitation by incorporating two different butting profiles on the same downtube. The superior strength is combined with a butting profile in the rest of the tube that maintains ride quality, and keeps the weight down. Secondly, the 853 DBZ tube is the proprietary bend. Niner worked with Reynolds to shape the tube for the SIR 9 so the tube can attach lower on the headtube, which reduces front end torsional flex, and increases steering precision, while adding strength.
Like the rest of Niner's bikes, the SIR 9 utilizes Niner's tried and true geometry. There are plenty of nifty features that you’ll find in the SIR 9. The Niner SIR 9 features the BioCentric bottom bracket system. The BioCentric makes adjustment easy across a wide range of gears and eliminates the need for adjustable dropouts, giving the cleanest possible solution for singlespeed use. The BioCentric offsets the bottom bracket spindle 8.5mm from center, offering greater range of adjustment compared to a more traditional EBB setup. Conventional EBB units mounted with set screws that can become tricky to finely adjust over time, or expansion wedges that can warp the bottom bracket shell of the frame, while split BB shells that clamp an EBB can stretch or ovalize. The BioCentric II shuns these quandaries by using two bolts to apply a clamping force on the outside edges of the BB shell, eliminating the likelihood of ovalizing or indexing the shell itself. The BioCentric II will certainly have you seeing singlespeed living in a whole new light.
Highlighting the Niner SIR 9 2 Star Single Speed build is Niner’s Cogalicious Single Speed Cog. Constructed from 7075 T-C aluminum, the Cogalicious reflects Niner’s dedication to bring quality to those who are seduced by the suffering that comes from having but only one gear. The Cogalicious is slightly offset so you can fine tune your chainline by flipping the cog, while the thick offset base prevents the damage of alloy freehub bodies under heavy loads. The Truvativ AKA cranks feature OCT hollow forged arms, keeping weight to a bear minimum without sacrificing strength and stiffness. Speaking of stiffness, The Niner RDO rigid carbon fork mates perfectly with Rock Shox’s 15mm Maxle for race-dominating power transfer and vibration dampening. Stan’s No Tubes and Schwalbe combine forces to offer a tubeless wheel set up that can corner, accelerate and climb. SRAM Elixir 5 brakes and brake levers inspire confidence in your braking to keep you descending like a sinned soul. Niner components rounds out the cockpit with a carbon seatpost and an alloy bar and stem. Not to mention, the ultra flashy head badge and dazzling paint is enough to make you swoon.
|Fork||Niner RDO Fork, 15MM|
|Wheelset||NOTUBES 3.30 SS/RAPID, 15MM FRONT, 142 X 12MM Rear|
|Tires||Schwalbe Rapid Rob EVO TL 2.40/Racing Ralph EVO|
|Brakes||SRAM Elixir 5 with 180/160MM G2 Rotors|
|Brake Levers||SRAM Elixir 5|
|Crankset||Truvativ AKA, 32T|
|Bottom Bracket||SRAM GXP|
|Cassette||Niner Cogalicious 20T|
|Chain||SRAM PC 1|
|Handlebar||NINER Flat Top Alloy, 710MM, Red Niner|
|Stem||NINER Alloy Stem, Red Niner Graphic|
|Saddle||WTB Volt Race with Cr-Mo Rails, Niner Graphic|
|Seatpost||NINER Carbon Seat Post, 400MM, Red Niner Graphic|
Note: Components are subject to change without notice.
|Effective Top Tube Length||592mm||609mm||628mm||647mm|
|Seat Tube Length||393mm||419mm||483mm||546mm|
|Head Tube Length||100mm||110mm||125mm||145mm|