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2024 Transition

Sentinel Alloy Frameset

A 29″ aluminum frame full suspension enduro frameset.

Manufacturer Price

$2,199
Weight9.7 lbs (frame)  
FrameAluminum
SuspensionFull, 150mm rear
ShockFox Float X Performance Elite
Wheels29″
Where to Buy
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Insights
Sizing
SM

5'0" – 5'7"

MD

5'4" – 6'0"

LG

5'8" – 6'3"

XL

6'0" – 6'7"

XXL

6'2" – 6'10"

🐐 Estimated

Rider Fit Notes

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Reviews

Summary

The Transition Sentinel is a versatile and lively enduro bike that excels in a variety of terrains, offering a balanced and intuitive handling experience. Its well-tuned suspension and composed nature at speed make it a reliable choice for aggressive riders, though it may require an active riding style to fully exploit its capabilities. While it pedals efficiently and climbs well, some riders may find the rear wheel traction and downhill performance areas for improvement.

Pros
  • Versatile and lively trail bike

  • Well-tuned and smooth suspension

  • Balanced and intuitive handling

  • Surprisingly deft climber with satisfying efficiency

  • Composed bike at speed and free of drama in the steeps

Cons
  • Short cockpit for seated pedaling

  • Rear end barely uses its travel, generating little traction

  • Initial acclimation period needed for rear wheel traction

  • Not the best for outright downhill performance

Key Quotes
There are many good trail bikes available today. I’ve tested many of them, and the new Transtition Sentinal is one of the very best.
Bicycling
The Transition Sentinel Carbon XT is a bike with a strong character.
Enduro Mountainbike Magazine logoEnduro Mountainbike Magazine
The Sentinel is a bit more subtle until you turn up the volume, and then you realize it's just as bad ass, but it's also more fun than the Enduro in lower angle terrain.
NSMB logoNSMB

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Bicycling
Is the Transition Sentinel a Superbike Hiding in Plain Sight?

Oct 2024

The latest iteration of Transition’s 150mm travel trail bike features in-frame storage and more balanced performance.

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Enduro Mountainbike Magazine
The new 2025 Transition Sentinel on test

Oct 2024 · Peter Walker

We have tested the new and radical trail bike – the Transition Sentinel 2025 – for you.

Highs
  • Well-matched components

  • Cool detail updates

  • Inspires huge amounts of confidence downhill

  • Rear suspension is progressive and generates plenty of traction

Lows
  • Comfortable climber

  • Tight space around the BOOM Box

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MTB Mag
[First Ride] Transition Sentinel V3

Oct 2024 · Ian Collins

In July I attended the launch of a new bike which I’ve given very high praise in its past iteration – the Transition Sentinel. Now in its third time around, the already highly versatile rig boasts updated geometry and improved kinematics as well as downtube storage, fully internal cable routing and a flip chip. I managed to get a few solid rides in on the new bike deep in the middle of Summer. Luckily, that coincided with a one-off rain storm that revitalized the local soil during an atypically dry Summer in Bellingham, Washington. The trails I rode included all

Read Review

NSMB
2025 Transition Sentinel

Oct 2024

The Sentinel has always been known as a trail bike that can be bent to fit different categories. The latest version continues the tradition.

Highs
  • Iterative updates result in a polished package

  • Excellent descending capability with good support

  • Climbs better than previous generation

  • Versatile geometry suits a wide range of riding

  • Smart features: BOOM Box storage, Fidlock base, cable routing options

  • Multiple build and material options

Lows
  • DT Swiss M 1900 wheels are heavy

  • Frame-only pricing not the best value

Read Review

Singletracks
The 2025 Transition Sentinel v3 is like a BMX bike’s bigger brother — powerful, fun, and ready for action [Review]

Oct 2024 · Tim Wild

I’m never going to threaten the podium at an enduro race — but the Transition Sentinel made me feel as if I could, and ride as if I should.

Highs
  • Super-nimble ride feel for such a large bike

  • Improved shock mount

  • Flip-chip allows for mixed wheel setup

Lows
  • Needs to be locked out to climb well

  • Might take some work to get the correct sizing

  • Seat clamp bolt could be recessed for weather protection

Read Review

Singletrack World
Transition Sentinel 2025: First Ride Review+

Oct 2024 · Singletrack Magazine

Transition Sentinel: 29er seeks adventurous riders for mutual outdoor fun. Sleek, sexy and BMX-y. 160mm up front, 150mm out back. Roving reporter Tim WIld tries out a 2025 Deep Purple Transition Se…

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Beta
Transition Introduces the Aluminum Sentinel and Scout - Video

Sep 2021 · Beta

When you've already seen every episode of The Dog and Pony Show

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Pinkbike
First Look: Transition Launch Alloy Scout and Sentinel

Sep 2021 · Seb Stott

Aluminum is back on the menu for Transition's popular Scout and Sentinel models.

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Geometry
Specs
Build
Frame

Sentinel Alloy 150mm

BB StandardBSA, 73mm, Threaded

Tire Clearance2.6"

ColorsMisty Green; Black Powder

Shock

Fox Float X Performance Elite, (205x62.5mm)

Travel150mm

Bottom Bracket

73mm BSA Threaded

Wheels
Tires

29 x 2.6

Rider Notes
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First added July 16

Last updated October 19

Not listed for 587 days