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First Look: Transition's 2018 Sentinel Carbon is Engineered to Party 2

One of the most intriguing new long-travel 29ers gets the fantastic plastic treatment for 2018.

First Look: Transition's 2018 Sentinel Carbon is Engineered to Party

For those of you who have been Sentimental over Transition's new Sentinel but only ride carbon, the wait is over. It's available in S, M, L and XL sizes and boasts all the same great features, hardware, and parts kits as the alloy model. Transition shaved an impressive 2.5-pounds (1.1kg) from the aluminum model, helping this modest 6.8-pound (3.1kg) carbon beauty of a frame to become a true rocket ship.


Sentinel Carbon Highlights

  • Carbon frame
  • 29-inch wheels
  • 140mm (5.5-inches) rear travel // 160mm (6.3-inches) front travel
  • Speed Balanced Geometry (SBG)
  • Boost 148 x 12mm dropout spacing
  • Metric trunnion shock sizing - 205 x 57.5mm
  • Enduro Max sealed bearings
  • Threaded bottom bracket
  • Molded rubber downtube and chainstay protection
  • New rattle-free internal cable port covers
  • External rear brake routing
  • 180mm post mount rear brake
  • Collet main pivot
  • Water bottle storage inside front triangle
  • Tire clearance up to 29 x 2.5-inches
  • Frame Weight: 6.8-pounds (3.1kg) with shock and hardware

In Action

"When dreaming up what to shoot for the Sentinel I couldn't narrow it down to one style of riding, so we shot four locations/riders – all of which found the Sentinel to be right at home. Enjoy!" - Skye Schillhammer






Transition's Speed Balanced Geometry concept incorporates the following five key geometry features:

  • Increased frame reach
  • Slacker headtube angle – Allows the fork to absorb impacts better on all angles, positions the front wheel further forward, and reduces deflection and dive.
  • Steeper seat tube angle – Brings rider more forward, aids in climbing traction, and reduces seated sag.
  • Shorter stem – Equates to a modest increase in total reach.
  • Shorter fork offset – Brings the front axle more rearward and under the rider which further increases front tire traction. Works in unison with the shorter stem length to provide a more direct steering input.


Build Kits, Pricing and Availability

Compared to the aluminum version, the new carbon steed is $1,000 more with identical components. Available early 2018.

X01 build - $5,999 USD
GX build - $4,999 USD


  • X01 build - $5,999 USD
  • GX build - $4,999 USD
  • Frameset - $2,999 USD

Full specs can be found at, as well as a photo-rich story from this ripping video shoot.

Video by Skye Schillhammer // Photos by Oliver Parish

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