The S.I.R. 9 is the most versatile bike in the Niner stable, fusing the “steel is real” feel of Reynolds tubing with the ability to run the frame as either a geared bike or single speed. The S.I.R. 9 uses the same custom drawn Reynolds 853 tubing as the M.C.R. 9 and combines it with Niner’s ultra-light eccentric bottom bracket. Custom “breezer” style forged dropouts have a replaceable alloy derailleur hanger and come with an insert piece for running the bike as a single speed to eliminate the unnecessary derailleur hanger for a clean look.

• Niner's most versatile steel hardtail for dirt connoisseurs
• Run singlespeed or geared
• Custom drawn, 29er specific Reynolds 853 tubeset
• angled toptube to maximize standover clearance
• s-bend chainstays
• Optimized for 80 to 100mm suspension forks
• Disc brake only
• Niner BioCentric EBB system for easy singlespeed set up
• Breezer style forged vertical dropouts with 2 derailleur hanger options (singlespeed or geared)

Frame Size	S	M	L	XL
A. Top Tube (effective)	23.1/23.2" 586/590mm	23.75/23.9" 603/606mm/font>	24.5/24.6" 622/625mm	25.25/25.4" 641/644mm
B. Seat Tube	393mm	419mm	482mm	546mm
C. Chain Stay Length	439mm	439mm	439mm	439mm
D. Front Center	641/646mm	653/658mm	672/677mm	692/697mm
E. Wheel Base	1073/1079mm	1084/1091mm	1104/1110mm	1124/1130mm
F. BB Drop	2.4/2.1" 61/53mm	2.4/2.1" 61/53mm	2.4/2.1" 61/53mm	2.4/2.1" 61/53mm
G. Head Tube Length	90mm	100mm	110mm	130mm
H. Seat Tube Angle (80/100)	74/73°	74/73°	74/73°	74/73°
I. Head Tube Angle	71.5/70.5°	72/71°	72/71°	72/71°
Stand Over Height (80/100)	706/710mm	727/732mm	779/785mm	832/838mm
Height Recommendation	5'3"-5'9" 1.6-1.75m	5'8"-6' 1.73-1.83m	5'11"-6'3" 1.8-1.91m	6'3"-6'7" 1.91-2.01m