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Niner Sir 9 Frame

Niner Sir 9 Frame

Item #: FR194A01
USD$999.00
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Niner Sir 9 Frame

Niner SIR 9 Frame

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.

Niner SIR 9 Frame Features

  • Tuned Geometry and Reynolds 853 Chromoly tubing for maximum strength and excellent ride at a light weight
  • Niner-Specific CYA Shell with included BioCentric II eccentric bottom bracket adaptor allows easy chain tensioning duties for single speed use
  • BioCentric shell once installed is effectively a 73mm threaded shell, and 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 compatible with internal (ZS44) top cup and (EC44) 1.5" external bottom cup. Cane Creek standard description: ZS44/28.6 | EC44/40
  • Niner Tapered Headset Included
  • 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 can be swapped out for SS insert (both included)
  • 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, not designed for electronic drivetrains
  • 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.
  • Weight: 4.63 lbs Med
GeometryChart
GEOMETRY (mm / inch)
Size Small Medium Large Extra Large
A: Seat Tube Length 393
15.5
419
16.5
483
19.0
546
21.5
B: Effective Top Tube 592
23.3
609
24.0
628
24.7
647
25.5
C: Stack 620
24.4
637
25.1
652
25.7
671
26.4
D: Reach 395
15.6
409
16.1
426
16.8
436
17.2
E: BB Height 0
0.0
0
0.0
0
0.0
0
0.0
F: BB Drop 49
1.9
49
1.9
49
1.9
49
1.9
G: Head Tube Length 100
3.9
110
4.3
125
4.9
145
5.7
H: Head Tube Angle 70.8 ° 71.3 ° 71.3 ° 71.3 °
I: Seat Tube Angle 72.3 ° 72.3 ° 72.3 ° 72.3 °
J: Standover Height 716
28.2
736
29.0
790
31.1
842
33.1
K: Chainstay Length 440
17.3
440
17.3
440
17.3
440
17.3
L: Wheelbase 1085
42.7
1096
43.1
1115
43.9
1135
44.7
Suggested Rider Height 150-165 cm
59-65"
160-175 cm
63-69"
170-185 cm
67-73"
180-198 cm
71-78"
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  • Martinique
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  • Saint Kitts and Nevis
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  • San Marino
  • Saudi Arabia
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  • Seychelles
  • Sierra Leone
  • Singapore
  • Slovakia
  • Slovenia
  • Somalia
  • South Africa
  • Spain
  • Sri Lanka
  • Suriname
  • Swaziland
  • Sweden
  • Switzerland
  • Syrian Arab Republic
  • Taiwan
  • Tanzania, United Republic Of
  • Thailand
  • Togo
  • Trinidad and Tobago
  • Tunisia
  • Turkey
  • Turkmenistan
  • Turks and Caicos Islands
  • Uganda
  • Ukraine
  • United Arab Emirates
  • United Kingdom
  • United States, Puerto Rico
  • Uruguay
  • Uzbekistan
  • Vanuatu
  • Venezuela
  • Vietnam
  • Virgin Islands, British
  • Wallis and Futuna
  • Yemen
  • Zambia
  • Zimbabwe
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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.