Sinister Frames

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Riding bikes is about fun, not complication right?! The Sinister Progression continues with another design that pedals very well and can be thrown around with ease on your favorite burly trail. The Sinister Gruitr is the bike to have for 2008!

We are rider owned and independent so we can do whatever we want and we want to have FUN on trails. Remember that?  4.5-5.5 inches of single pivot love floating on needle bearings with BTF inspired geometry ensure that you will step it up this year! Climb up and then SHRED, CARVE and RIP down with aplomb.

With in house design and Canadian welding and fabrication, this 6061 aircraft aluminum 7lb frame (with air shock) is what you need. Get your name on one of these beauties and put the FUN back into biking on aggressive trails.


  • All 6061 aluminum construction
  • 73 mm bottom bracket
  • 1.125 inch head tube
  • 4.5 or 5.5 travel (7.875 x 2.0 shock)
  • 27.2 mm seat post
  • 31.8 mm seat collar
  • 2.35 tire capacity
  • Needle bearings to last longer and ease of maintenance
  • International standard brake only
  • 7 lbs with a Fox Float R
  • Air or coil shock
Small Medium Large
Head Angle 68 deg 68 deg 68 deg
Top Tube Length 22" 23" 24"
Seat Tube Angle 73 deg 73 deg 73 deg
Seat tube length (center to end) 15" 15.5" 16.5"
BB Height 13.5" BB 13.5" BB 13.5" BB
CS length 16.5" 16.5" 16.5"
Intended fork travel 120 mm (5") on ST up to 180 mm (7") on STD