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bicycle parts: Niner Sir 9 Single Speed Mountain Bike Frame 15In Small 29Er 142X12mm BUY IT NOW ONLY: $449.99

The Niner SIR ("Steel Is Real"). This one has an Eccentric Bottom bracket, thus allowing chain tensioning for a Single Speed or Internally Geared Hub setup.

Niner Bikes » S.I.R.9 | Jungle Products Ltd