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Transition Sentinel Mountain Bike Alloy Frame - 2018


The Transition Sentinel alloy mountain bike frame was designed for people who up until know considered themselves as 29er haters. A bike so capable, playful and fun that even the most-staunch 29er naysayer will instantly convert. With Transition’s reverse mullet suspension configuration, the Sentinel stays responsive and playful while delivering incredible downhill monster truck capabilities. 

Their new Speed Balanced Geometry (SBG) is Transition’s crown jewel that unlocks 100% of the potential of this bike. With SBG you get total confidence when it comes to cornering and climbing helping you take your riding to another level. SBG ensures the bike maintains low speed agility, front wheel traction, and proper rider weight balance while actually increasing confidence in steep terrain and at high speeds. With SBG, a slacker head tube angle is combined with an all-new reduced offset fork standard, preventing the front wheel from being too far in front of the rider. This improves front to rear weight distribution on the bike, which is often out of balance on long and slack bikes. One of SBG's greatest benefits is that it creates a confident steering feel that adapts to wheel speed. More stability when going fast, more agility on technical slow speed sections as well as improved traction, control and confidence for any skill level of rider. 


Frame Specification:

  • Fork Axle to Crown: 571mm
  • Fork Offset: 42mm (Rockshox) / 44mm (Fox)
  • Rear Shock Size: 205mm x 57.5mm
  • Shock Hardware: Trunion Mount Top / 25mm x 8mm Bottom
  • Headset (Top): 44mm Zero Stack
  • Headset (Bottom): 56mm Zero Stack
  • BB Shell: 73mm BSA Threaded
  • Rear Brake Mount: 180mm Post Mount
  • Rear Axle: Syntace X12 12mm x 148mm
  • ISCG Tabs: ISCG 05
  • Seatpost Diameter: 31.6mm
  • Seat Clamp: 34.9mm
  • Max Chainring Size: 34T
  • Max Tire Size: 29 x 2.5

Geometry & Sizing Information