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2018 Transition

SENTINEL Frameset

A 29″ full suspension enduro frameset.

Manufacturer Price

2999 US$(2579 €)
Weight3,1 kg (frame)  
SuspensionFull
Wheels29″
BrakesHydraulic Disc
Where to Buy
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Insights
Sizing
SM

154cm – 170cm

MD

164cm – 182cm

LG

175cm – 190cm

XL

184cm – 200cm

🐐 Estimated

Rider Fit Notes

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Reviews

Summary

The Transition Sentinel is a formidable enduro bike, excelling in downhill performance with a design that inspires confidence on rough and steep terrain. Its suspension system, featuring Speed Balanced Geometry (SBG), provides a plush ride that handles everything from chattery trails to big drops, though it requires an active riding style to shine. While it climbs competently, it's happiest when pointed downhill, offering stability and playfulness that rewards aggressive riders.

Pros
  • Supreme confidence in bombing downhill

  • Improved stability and handling with Speed Balanced Geometry (SBG)

  • Ultra-plush suspension that handles rough terrain well

  • Excellent for steep and unforgiving terrain

  • Good balance between support and traction in suspension

Cons
  • Requires an active riding style

  • Slightly cumbersome on tighter switchbacks

  • Not as snappy in pedal efficiency as others

  • Heavy, not for those who count grams

  • Front wheel tends to flop on tight climbs

Key Quotes
The Sentinel is most at home bombing downhill. It does this ridiculously well.
BIKE Magazine logoBIKE Magazine
Transition seems to have broken into a new realm of geometry with the Sentinel.
Freehub logoFreehub
Where other bikes reach their limits, the Sentinel only just gets going.
Enduro Mountainbike Magazine logoEnduro Mountainbike Magazine
This bike is also as tough as they come, we beat this bad boy up and it came back for more.
Revolution Mountain Bike Magazine logoRevolution Mountain Bike Magazine
the amount of stability provided while cruising at mach-3 was incredible
Vital MTB logoVital MTB

Feedback?

View all reviews

MBR
Transition Sentinel Carbon GX: first ride - MBR

jul 2019 · Mick Kirkman

The full carbon Transition Sentinel frame looks super slick, and ticks just about every box in the ‘modern geometry’ checklist.

Highs
  • One of a handful of 140mm travel 29ers that are truly Alpine ready

Lows
  • Less urgent and spritely pedalling than plenty similar travel rigs

Read Review

Enduro Mountainbike Magazine
Transition Sentinel Review

dic 2018 · Christoph Bayer

The Transition Sentinel is very similar to the competition in terms of travel and weight. In practice, however, the other bikes were not able to keep up.

Highs
  • Unstoppable on demanding tracks

  • Very stable at high speed

  • Great spec

Lows
  • Gets bored on simple trails

  • Requires an active riding style

  • On tight climbs, the front wheel tends to want to flop from side to side

Read Review

MTB Mag
[Tested] Transition Sentinel X01 Carbon

ago 2018 · Mauro Franzi

After our recent test of the Transition Patrol, many readers asked for a comparison with the Sentinel, the Enduro 29er from the American brand. We got ahold of the Sentinel in its top-level, X01 Carbon build, for another test and a head-to-head comparison between the two models. This is therefore going to be a slightly different review, in which we will also compare the two bikes throughout. Despite the different length travel, 160mm at the front and 140mm at the rear for the Sentinel, there are a lot of common aspects, for example the Speed Balanced Geometry and the suspension scheme: a four bar

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Freehub
Transition Sentinel // Bike Review

ago 2018 · Spencer Johnson

I love to ride heinously steep trails... It’s kind of my thing. So when I heard about Transition Bikes’ new Speed Balanced Geometry (SBG), a platform that supposedly improves upon stability and handling by adjusting crucial angles and the offset of the front wheel, I was immediately excited. The biggest change they made is to what’s called steering trail, or the function of the headtube angle, fork offset and wheel size. While the changes in frame geometry that have been made in the past five years are staggering, steering trail has not changed, and so, according to Transition, “modern” geometry is still being held back by trail. The biggest reason for this is the fork offset, because that would mean not just tweaking a bike’s geometry, but creating a new standard for forks—and that would mean getting giants like RockShox and Fox on board. Somehow, the wizards at Transition managed to do just that, enabling their SBG platform to be brought to the masses. As a rider who seeks out the most aggressive trails that I can find, I’m all ears to any advantages that geometry can provide. With a symphony of updates—including a steeper seat tube angle, longer reach, shorter stem, super slack head tube angle and reduced fork offset—there’s no way this bike could not handle starkly different. The Sentinel was Transition’s first bike with SBG to hit the market, although now their Patrol, Scout and Smuggler have the technology too. As a big bike with big wheels and a good amount of travel (160mm in the front, 140 in the rear) the Sentinel is a bike designed for the exact kind of terrain I like to ride. And, as Transition claims, it’s a bike “designed for 29er skeptics,” meaning with the updated geo it should have maximum maneuverability coupled with unparalleled stability. Well, there’s only one way to find out.

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Vital MTB
2018 Transition Sentinel X01

mar 2018 · bturman Rconroy

Transition's fresh approach to geometry results in a bike that handles incredibly well, encouraging you to get after it that much harder. It's portly but built to last.

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Revolution Mountain Bike Magazine
[R]eviewed: Transition Sentinel

feb 2018 · Scott Prendergast

WELL LISTEN UP KIDS! WE REVIEW A LOT OF BIKES AND FROM TIME TO TIME WE GET ONE THAT’S ALWAYS A BIT OF A SURPRISE. THE TRANSITION SENTINEL IS NO JOKE, AS A MATTER OF FACT WE DON’T WANT TO GIVE THIS BIKE BACK. This rig bleeds as much style as Mick Jagger on the dance floor. A long travel (140mm rear, 160mm front) 29’er is reasonably new for Transitions range, previously they had the Smuggler with 115mm of rear […]

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Velo
The Week in Tech: Transition Sentinel sheds pounds, new SRAM brakes

ene 2018 · Michael Better

Transition offers a Sentinel trail bike in carbon fiber, Wahoo has a forearm-mounted heart rate monitor, and much more.

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BIKE Magazine
Bible Review: Transition Sentinel Carbon X01

dic 2017

Pioneer of long and slack, Transition waves the carbon fiber wand at its long-travel 29er, thus intensifying an already burly performer.

Read Review

Geometry
Specs
Build
Shock

205mm x 57.5mm

Bottom Bracket

73mm BSA Threaded

Headset

44mm Zero Stack (Top) / 56mm Zero Stack (Bottom)

Seatpost

31.6mm

TypeRigid

Groupset
Front Derailleur

No Support

Brakes

180mm Post Mount

TypeHydraulic Disc

Rider Notes
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