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Niner Ros 9 4 Star X01 Bike

Item #: BI226P18
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Niner ROS 9 4 Star X01 Bike

The Niner ROS 9 is a versatile 4130 Cro-Mo steel frame with aggressive geometry which brings modern technology (oversized headtube, internally routed dropper post routing, and 12x142mm rear dropouts) to a frame that will last a lifetime. The ROS 9 borrowed the SIR 9’s rear dropout design to allow 12x142mm rear hub configurations while still supporting the replaceable alloy derailleur hanger and allowing more surface area for a full weld around the entire end of the chain and seat stays ultimately creating a stiffer rear end. With a BioCentric II bottom bracket, the frame is single-speed capable. If running this as a multi-speed, the BB height can be adjusted when using a BioCentric II bottom bracket to fit this bike to your specific needs. The ROS 9 features super-short chainstays and a slack headtube angle to better the handling at high speeds. The front and rear derailleur mounts are removable/replaceable. The R.O.S. 9 accepts internal and externally routed dropper posts with an alloy cover to block the port and keep out any debris if you choose not to use it. The ROS 9 also features tabs under the bottom bracket shell to mount a proprietary MRP XCG bash guard (sold separately).

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 which reduces shift forces and prevents “ghost shifting”. The X01 drivetrain brings the latest and greatest SRAM technologies to your new complete bike offering a simple, clean, and more importantly, reliable drivetrain to your Niner ROS 9.

Niner ROS 9 4 Star X01 Bike Features

  • 73mm BB Width (with BioCentric II installed)
  • BioCentric II is compatible with external bearing cranks only
  • Direct mount front derailleur, high mount, top pull, removable front derailleur mount
  • Tabs under BB shell for custom MRP XCG Bash Guard - sold separately
  • 31.6mm seat post size, compatible with internal and external dropper post routing
  • 34.9mm seat collar size
  • 44mm headtube. Tapered headset with internal (ZS) top cup and 1.5" external bottom cup (included with frame). Cane Creek standard description: ZS44/28.6|EC44/40
  • All sizes have one bottle mount in the front triangle
  • Replaceable derailleur hanger or SS insert
  • 142 x 12mm Maxle rear spacing
  • Can fit up to a 2.34" tire (tire size varies by brand, some tires may not fit)
  • Compatible with most standard 1x, 2x and 3x chainring systems. Max 1x chainring size is 32T with BioCentric II in rear position - Max 38T with BioCentric II in forward position
Specifications
Frame Niner ROS 9
Fork RockShox Revelation RCT3 Solo Air, 130mm travel, 15mm thru axle
Wheels Stan's NoTubes 3.30/ZTR Flow EX, 15mm Front, 12x142mm Rear
Tires Schwalbe Nobby Nic Snakeskin TL 2.35
Brakes SRAM Elixir 9 Trail, 180/160mm G2 rotors
Shifter SRAM X01 11 speed
Rear Derailleur SRAM X01 11 speed
Front Derailleur N/A
Cassette SRAM XD-1195 11spd 10-42T
Chain SRAM PC-1170
Crankset SRAM X01 32T
Bottom Bracket SRAM GXP
Saddle WTB Volt Race, Niner Graphic
Seatpost Niner Carbon Seat Post, Red Graphic
Handlebar Niner Flat Top 780mm, Red Graphic
Stem Niner Alloy Stem, Red Graphics

Niner ROS 9 Frame Geometry (120mm Fork)
Size Small Medium Large Extra Large
Effective Top Tube Length 578mm 595mm 614mm 633mm
Seat Tube Length 394mm 431mm 471mm 534mm
Head Tube Length 100mm 110mm 125mm 145mm
Head Angle 68° 68° 68° 68°
Seat Angle 74° 74° 74° 74°
BB Drop 56mm 56mm 56mm 56mm
Front Center 677mm 695mm 716mm 737mm
Wheel Base 1098mm 1116mm 1136mm 1158mm
Chain Stay Length 427mm 427mm 427mm 427mm
Horiz. Chainstay 418/423mm* 418/423mm* 418/423mm* 418/423mm*
Reach 396mm 411mm 426mm 439mm
Stack 634mm 643mm 657mm 675mm
Standover Height 709mm 730mm 783mm 833mm

Niner ROS 9 Frame Geometry (140mm Fork)
Size Small Medium Large Extra Large
Effective Top Tube Length 581mm 598mm 617mm 636mm
Seat Tube Length 394mm 431mm 471mm 534mm
Head Tube Length 100mm 110mm 125mm 145mm
Head Angle 67° 67° 67° 67°
Seat Angle 73° 73° 73° 73°
BB Drop 49mm 49mm 49mm 49mm
Front Center 683mm 701mm 722mm 743mm
Wheel Base 1105mm 1123mm 1144mm 1165mm
Chain Stay Length 427mm 427mm 427mm 427mm
Horiz. Chainstay 418/423mm* 418/423mm* 418/423mm* 418/423mm*
Reach 386mm 400mm 415mm 428mm
Stack 632mm 641mm 655mm 674mm
Standover Height 712mm 733mm 787mm 839mm

*BioCentric II in max rearward/forward position. Geometry measures are shown for 120mm and 140mm travel forks. Note that the increased height and offset of the Fox 34 140mm fork yield approximately .5° slacker head and seat tube angles and a 12mm longer wheelbase.

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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.