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Niner Sir 9 Frame

Item #: FR228A02
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Niner SIR 9 Frame 2014

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 adds 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 dazzing paint is enough to make you swoon.

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)
  • Compatible with standard 3x chainring systems
  • SRAM recommended 2x chainrings: 26/39T or lower
  • SRAM XX1 recommended max chainring: 36T with BioCentric forward. Q-Factor: 168mm
  • SHIMANO XT recommended 2x chainrings: 28/40T or lower
  • SHIMANO XTR 2x is not recommended. Both versions (40t/48.8mm chain line and 38t/46.6mm chain line) position the large chainring in a way that it may contact the frame.
Geometry (80mm fork)
Size Small Medium Large Extra Large
Effective Top Tube Length 589mm 605mm 624mm 643mm
Seat Tube Length 393mm 419mm 483mm 546mm
Head Tube Length 100mm 110mm 125mm 145mm
Head Angle 70.8° 71.3° 71.3° 71.3°
Seat Angle 73.3° 73.3° 73.3° 73.3°
BB Drop 56mm 56mm 56mm 56mm
Front Center 646mm 658mm 678mm 696mm
Wheel Base 1078mm 1089mm 1109mm 1128mm
Chain Stay Length 440mm 440mm 440mm 440mm
Reach 405mm 418mm 433mm 446mm
Stack 614mm 622mm 645mm 659mm
Standover Height 711mm 732mm 785mm 836mm

Geometry (100mm fork)
Size Small Medium Large Extra Large
Effective Top Tube Length 592mm 609mm 628mm 647mm
Seat Tube Length 393mm 419mm 483mm 546mm
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°
BB Drop 49mm 49mm 49mm 49mm
Front Center 651mm 664mm 684mm 701mm
Wheel Base 1085mm 1096mm 1115mm 1135mm
Chain Stay Length 440mm 440mm 440mm 440mm
Reach 395mm 409mm 423mm 436mm
Stack 620mm 637mm 652mm 671mm
Standover Height 716mm 736mm 790mm 842mm
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by PowerReviews
Niner Sir 9 Frame

(based on 1 review)

Ratings Distribution

  • 5 Stars



  • 4 Stars



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  • 2 Stars



  • 1 Stars



Reviewed by 1 customer

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Steel Is Real

By mrlambing

from Riverside, CA

About Me Avid Cyclist

Verified Reviewer


  • Attractive Design
  • Did I Mention The Steel
  • Durable
  • Lightweight
  • Steel
  • Steel Frame


  • Heavier Than Carbon

Best Uses

  • Mountain Biking

Comments about Niner Sir 9 Frame:

This bike is incredible. You will not understand until you have rode one. Steel is most definitely the real deal. For most of us, who are not at the top of our class sponsored athletes, we ride for the pleasure of riding. This is the bike that helps you remember why you mountain bike!

  • Was this a gift?:
  • No

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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.