2021 Transition

Sentinel Carbon GX

A 29″ carbon frame full suspension enduro bike with high-end components.
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MSRP$5,899
Weight31.3 lbs  
FrameCarbon
SuspensionFull, 150 / 160mm
ForkRockShox Lyrik Ultimate
ShockRockShox Super Deluxe Ultimate
Wheels29″ Aluminum
Drivetrain1 × 12
GroupsetGX Eagle, Truvativ Stylo
BrakesHydraulic Disc
SeatpostDropper
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
Sentinel Carbon GX
Other Enduro bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

26 mph

Sentinel Carbon GX

26 mph

Similar Bikes

Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Compare the full Sentinel model range

View Comparison
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
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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Enduro Mountainbike Magazine
2021 Transition Sentinel XT review – A powerful bike for powerful riders!

Jan 2021 · Christoph Bayer

Our expectations of the Transition Sentinel Carbon were very high for this group test,not least because the guys and gals behind the brand are really good riders themselves. Its specs look extremely promising, but can the bike deliver on the trail?

Highs
  • Rewards an active riding style

  • Lots of reserves for big impacts

  • Excellent climbing characteristics

Lows
  • Punishes a passive riding style

  • Not enough traction in rough terrain

  • Very stiff bike overall

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NSMB
2021 Transition Sentinel Review

Jan 2021

Since it was launched, the Transition Sentinel has been a bellwether for progressive trail bike geometry. The 2021 Sentinel is no exception, but in this case the trend indicates that trail bike geometry is stabilizing. I know this, because I went from the last generation Sentinel to this one, and even though I sized up from a Large to an XL, they're both clearly cut from the same cloth, and I have to say I'm a fan of the tailor.

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MTBR
Review: 2020 Transition Sentinel

Nov 2020

Can this revamped long-travel 29er out-perform the original? - Mtbr.com

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Freehub
Bike Review | Transition Sentinel GX

Apr 2020

There’s more than meets the eye with the latest and greatest version of Transition Bikes’ Sentinel. The crisp edges and gentile curves are surely drool-worthy, but if a bike doesn’t ride at least twice as good as it looks, what’s the point? Thankfully, the sorcerers at Transition put the utmost importance on how a bike rides, the reason they’ve gone above and beyond to develop their SBG geometry, adapting their numbers to match the needs of modern-day trail bikes. As for the new Sentinel, the biggest update is an extra 10mm of travel. While this might not seem like much, it brings the bike into a new category of sendability. The steadfast feeling that the company’s bikes are so well known for, simply because it’s perfectly suited to the Northwest, hasn’t wavered, yet they’ve also managed to ramp up the responsiveness and playfulness.

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BIKE Magazine
First Ride: The New Transition Sentinel

Apr 2020

What do you do to update a bike that was already ahead of its time, like the Transition Sentinel? Not much. And as it turns out, that was just enough.

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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

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Geometry
99 Spokes on YouTube99 Spokes on YouTube
Specs
Build
Frame

Sentinel Carbon 150mm

ColorsTi Grey; Loam Gold

Fork

RockShox Lyrik Ultimate, 160mm Travel/42mm Offset

Travel160mm

Spring TypeAir

Shock

RockShox Super Deluxe Ultimate

Travel150mm

Spring TypeAir

Headset

FSA No.57E

Stem

ANVL Swage (40mm)

Handlebar

ANVL Mandrel Alloy 35, SM/MD (800x20), LG/XL (800x30), XXL (800x 40)

Saddle

ANVL Forge Cromo

Seatpost

OneUp Dropper Post, SM (150mm), MD (180mm), LG/XL/XXL (210mm)

TypeDropper

Grips

Sensus Lite

Groupset
Rear Derailleur

SRAM GX Eagle

Crank

SRAM Stylo 7K DUB (30t/170mm)

Shifters

SRAM GX Eagle

Cassette

SRAM XG 1275 (10-52t)

Chain

SRAM GX Eagle

Brakes

SRAM Code RSC

TypeHydraulic Disc

Wheels
Rims

Stans Flow S1

Spokes

Sapim Race Double Butted

Front Hub

Stans Neo Durasync

Rear Hub

Stans Neo Durasync

Tires

Front: Maxxis Assegai 3C EXO+ (29x2.5), Rear: Maxxis Minion DHRII 3C EXO+ (29x2.4)

Disc Rotors

SRAM Centerline (200mm)

Rider Notes
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Last updated June 2
Not listed for 1,025 days