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Niner Sir 9 4 Star X01 Bike

Item #: BI226A06
Availability Please make a selection
Quantity   Out of stock.

Note: Photos are for illustration purposes. You will be shipped a complete bike with the specifications listed below.

Niner SIR 9 4 Star X01 Bike

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 and 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. The BioCentric offsets the bottom bracket spindle 8.5mm from center, offering greater range of adjustment compared to a more traditional EBB setup. Not to mention, the ultra flashy head badge and dazzling paint is enough to make you swoon.

Outfitting the Niner SIR 9 4 Star is the highly sought after SRAM X01 group. X01 brings SRAM’s 11 speed mountain drivetrain to the masses with a lower price point without sacrificing performance. X01 is slightly heavier than XX1 (the difference is under 100g) but is still much lighter than any 2x10 setup out there while still offering a wide gear range, thanks to the 10-42T X-Dome cassette. The new X01 cranks feature carbon arms and a removable spider (much like the X0 cranks) along with SRAM’s new X-Sync tooth profile which acts as a built in chain guide system. The rear derailleur’s X-Horizon design eliminates any vertical movement, reducing shift forces and preventing “ghost shifting”. The X01 drivetrain brings the latest and greatest SRAM technologies to your beautiful Niner SIR 9 bike, offering a simple, clean, and more importantly, reliable drivetrain.

With X01completeing the SIR 9 4 Star, it would be easy to over look the rest of the components. However, the remaining areas of the SIR 9 4 Star doesn’t deserve to go unmentioned. The RockShox SID XX provides 100mm of travel upfront with a tapered head tube and 15mm axle for an exuberant amount of stiffness. Stan’s No Tubes and Schwalbe combine forces to offer a tubeless wheel set up that can corner, accelerate and climb. SRAM Elixir 9 brakes and brake levers inspire confidence in your braking to keep you descending like a sinned soul. Niner round out the cockpit with a carbon seatpost and an alloy bar and stem.

2014 Niner SIR 9 Frame Features

  • 73mm BB width (with BioCentric installed)
  • BioCentric is compatible with external bearing cranksets only
  • 27.2mm seat post size, 400mm length recommended
  • 28.6mm front derailleur, high mount, bottom pull
  • 29.6mm seat collar size
  • Tapered headset with internal (ZS) top cup and 1.5" external bottom cup. Cane Creek standard description: ZS44/28.6 | EC44/40
  • Small frame has one bottle mount inside the front triangle. Medium, large and XL have two bottle mounts inside the front triangle
  • Replaceable derailleur hanger or SS insert
  • 12 x 142mm Maxle rear spacing
  • Can fit up to a 2.4” tire (tire size varies by brand, some tires may not fit)
  • Niner head badge
Wheelset NOTUBES 3.30/ZTR ARCH EX, 15MM FRONT, 142x12mm REAR
Shifter SRAM XO1 11spd
Front Derailleur N/A
Rear Derailleur SRAM XO1 11spd
Crankset SRAM X1 32t
Bottom Bracket SRAM GXP
Cassette SRAM XG- 1195 11spd 10-42t
Chain SRAM PC1170
Pedals N/A

Note: Components are subject to change without notice.

Size Small Medium Large Extra Large
Effective Top Tube Length 592mm 609mm 628mm 647mm
Seat Tube Length 393mm 419mm 483mm 546mm
Standover Height 716mm 736mm 790mm 842mm
Stack 620mm 637mm 652mm 671mm
Reach 395mm 409mm 423mm 436mm
Head Tube Length 100mm 110mm 125mm 145mm
Head Angle 69.8° 70.3° 70.3° 70.3°
Seat Angle 72.3° 72.3° 72.3° 72.3°
Wheelbase 1085mm 1096mm 1115mm 1135mm
Chainstay Length 440mm 440mm 440mm 440mm
BB Drop 49mm 49mm 49mm 49mm
Front Center 651mm 664mm 684mm 701mm

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Get free shipping with your $50 purchase today when you choose Standard Shipping at checkout. Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items

Due to manufacturer restrictions, this product cannot be shipped to the following locations:
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  • Virgin Islands, British
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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.