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Niner Ros 9 Frame

Item #: FR234I00
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USD$898.99
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Niner ROS 9 Frame

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).

Niner ROS 9 Frame Specifications

  • 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

Niner ROS 9 Frame Geometry

Size (120mm fork) 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
Size (140mm fork) 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.