•  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
•  Niner's proven hardtail 29er geometry
•  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)

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. 

Frame Only

Bottom Bracket Thread	73mm English
Brake Type	IS Disc
Color	Niner Green
Derailleur Clamp Type	28.6mm Clamp
Frame Spacing	135mm Spacing
Head Tube Size	1.125"
Material	Reynolds 853
Seat Post Size	27.2mm
Size	Medium
Type	MTB
Wheel Size	29"

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