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Today’s Deals2025 Transition
Sentinel Alloy Eagle 90
A 27.5″ / 29″ aluminum frame full suspension enduro bike with ultra high-end components.
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Manufacturer Price
$3,699| Frame | Aluminum |
|---|---|
| Suspension | Full, 150 / 160mm |
| Fork | RockShox Lyrik Select+ |
| Shock | RockShox Super Deluxe Select+ |
| Wheels | 27.5″ / 29″ Aluminum |
| Drivetrain | 1 × 12 |
| Groupset | Eagle 90 Transmission |
| Brakes | SRAM Maven Bronze Hydraulic Disc |
| Seatpost | Dropper |
Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.
Compare the full Sentinel model range
View Comparison4'8" – 5'3"
5'0" – 5'7"
5'4" – 6'0"
5'8" – 6'3"
6'0" – 6'7"
6'2" – 6'10"
🐐 Estimated
None yet.
Do you have this bike? Help other riders make a decision about which size will work for them by sharing your own size and fit notes.
Summary
The Transition Sentinel is celebrated for its robust downhill performance, precise handling, and progressive rear suspension that excels in generating traction. Its updates, including a redesigned chainstay protector and integrated BOOM Box storage, enhance its modern appeal. While it climbs comfortably, it may require locking out the rear shock for optimal efficiency on technical uphills. The Sentinel's versatility and aggressive geometry make it a standout in the enduro category, rewarding riders with control and precision on challenging terrain.
Robust downhill performance
Precise handling
Progressive rear suspension with excellent traction
Modern updates like BOOM Box storage and redesigned chainstay protector
Versatile and aggressive geometry
Rear suspension bobs on technical uphills
Long frame can feel cumbersome in tight sections
Needs to be locked out for optimal climbing efficiency
Transition clearly focused on downhill performance with the new Sentinel
Enduro Mountainbike MagazineThe Sentinel will never be the wrong choice, short of an XC race.
NSMBIt’s not conquering or resisting or dominating the trail – it’s dancing with it.
Singletrack WorldFeedback?
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Oct 2024
The latest iteration of Transition’s 150mm travel trail bike features in-frame storage and more balanced performance.
Oct 2024 · Peter Walker
We have tested the new and radical trail bike – the Transition Sentinel 2025 – for you.
Well-matched components
Cool detail updates
Inspires huge amounts of confidence downhill
Rear suspension is progressive and generates plenty of traction
Comfortable climber
Tight space around the BOOM Box
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
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.
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
DT Swiss M 1900 wheels are heavy
Frame-only pricing not the best value
Oct 2024 · Jessie-May Morgan
As is stock, it was provided with dual 29" wheels, with the 205mm x 60mm shock giving 150mm of rear wheel travel.
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.
Super-nimble ride feel for such a large bike
Improved shock mount
Flip-chip allows for mixed wheel setup
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
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…
| Frame | Sentinel Alloy 150mm BB Standard: BSA, 73mm, Threaded Colors: Deep Purple; Glacier White; Graphite Grey |
|---|---|
| Fork | RockShox Lyrik Select+, (160mm) Travel: 160mm |
| Shock | RockShox Super Deluxe Select+, (205x60mm) Travel: 150mm |
| Bottom Bracket | 73mm BSA Threaded |
| Headset | FSA No.57E |
| Stem | ANVL Swage (40mm) |
| Handlebar | ANVL Mandrel Alloy 35, XS/SM (800x20mm), MD/LG/XL (800x30mm), XXL (800x40mm) |
| Saddle | SDG Bel Air 3 |
| Seatpost | OneUp Dropper Post, XS (120mm), SM (150mm), MD (190mm), LG (210mm), XL/XXL (240mm) Type: Dropper |
| Grips | ODI Elite Flow Lock-On |
| Rear Derailleur | SRAM Eagle 90 |
|---|---|
| Crank | SRAM Eagle 90 DUB, (30t/165mm) |
| Shifters | SRAM Eagle 90 MMX |
| Cassette | SRAM XS 1275 T-Type (10-52t) |
| Chain | SRAM GX Eagle Transmission |
| Chain Guide | ISCG05 |
| Brakes | SRAM Maven Bronze Type: SRAM Maven Bronze Hydraulic Disc |
| Rims | DT Swiss M 1900 Spline 30 |
|---|---|
| Spokes | DT Swiss Champion |
| Front Hub | DT Swiss 370 Ratchet LN |
| Rear Hub | DT Swiss 370 Ratchet LN |
| Tires | Front: Maxxis Assegai 3C EXO+ (2.5), Rear: Maxxis Minion DHRII 3C EXO+ (2.4) |
| Disc Rotors | SRAM Centerline (200mm) |
First added July 12
Last updated April 4
Not listed for 55 days