Niner SIR 9


Take charge of your ride with this Reynolds 853 Steel frame designed around Niner’s [R]evolution trail geometry which begs the rider to push their limits. Ride it hard. Ride it fast. After all, it’s made from a truly time-tested material that’s been air hardened and heat treated. The efficient, yet compliant ride quality of the SIR 9 harkens back to a simpler time. A time without linkages and complicated shock settings. A time where all the energy you put into the pedals moves you forward.

  • Redesigned bottom bracket and chainstay junction: Keeping ride quality in mind as well as tire clearance, we went to great lengths to design this crucial frame junction. The PF 30 Bottom Bracket allows you to run a standard press fit bottom bracket or, if simplicity is your thing, throw in an eccentric bottom bracket and run singlespeed. A hidden plate inside the chainstay yoke stiffens and strengthens in order to improve power transfer.
  • Multiple mounting options: Pack it in, pack it out: Eighteen. As in 18 mounting points allow you to run racks and fenders, a bento box, water bottles, etc. This frame is versatile.
  • Niner’s [R]evolution trail geometry: Our trail geo puts the rider in the sweet, balanced spot on the bike. Longer top tube, slacker headtube and shorter chainstays all mean more fun and better handling.


  • Legendary Reynolds 853 steel frame provides the supple, comfortable ride you expect from the best steel available.
  • Compatible with 29X2.4 or 27.5X3.0 to offer the choice of maximum rollover or ultra traction and stability.
  • Revised geometry is ideal for trail riding, long days in the saddle, and all-around good times.
  • Integrated bag mounts inside and on top of front triangle.
  • Rear rack mounts (55lb limit)
  • 73mm PF30 BB shell lets you run a 30mm spindle crank, or a 24mm with adapter, or single speed with eccentric adapter.
  • 148 x 12 Boost rear spacing, 110 x 12 fork
  • Compatible with 1x (max 36t) and 2x (26/36 or bigger, w/34.9mm side-swing, front pull FD) drivetrains.
  • Base build is on Sram NX1, GX and X01 options available
  • Frameset available – let us help you build your dream hardtail/bikepacking ride!