Transition Bikes

Sentinel Carbon Desert Dusk Complete Angle

Sentinel Carbon Silver Mist Complete Angle

Sentinel Carbon Desert Dusk Complete In The Wild

Sentinel Carbon Silver Mist Complete In The Wild

Send-it-all on the Sentinel

A bike that says yes to every trail, every ride, and begs for more.

The Sentinel rides the lines between planted bottomless sender and playful, poppy trail pony. This leaves it right in the sweet spot, as we like to call it. Its versatile attitude helps riders excel and push their limits, making it the "one bike" most will need. Its intuitive nature is easy to get acquainted with; you'll find yourself sending lines, jumps, and maneuvers you always felt were beyond your ability. Where before you went around, now you go over. Where you pushed up, now you pedal. Where you rolled, now you boost. It's time to Send-It-All.

AVAILABLE COLORS:

Silver Mist

Desert Dusk

SELECT BUILD

$3,999 USD

$5,499 USD

$6,999 USD

$7,999 USD

SELECT SIZE/COLOR

Small MX

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Small MX

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Medium MX

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Medium MX

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Medium 29

Ships appx: 04/30/26

Medium 29

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Large MX

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Large MX

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Large 29

Ships appx: 04/30/26

Large 29

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X-Large 29

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X-Large 29

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View Closeout Sentinel Models Here!

$3,999 USD

IN STOCK: Ships within 2 business days

FREE SHIPPING: We offer free shipping on all bikes and frames, see checkout for additional details.

SHIP TO DEALER: If you prefer picking your bike up from your local authorized Transition Bikes dealer with free professional assembly, please make sure you choose Ship To Dealer during check out.

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PRICE

$3,999 USD

$5,499 USD

$6,999 USD

$7,999 USD

FRAME

Sentinel Alloy 150mm

Sentinel Carbon 150mm

WHEEL SIZE

29" & Mixed

REAR SHOCK

RockShox SuperDeluxe Base
(205x60mm)

RockShox Super Deluxe Ultimate
(205x60mm)

Fox Float X2 Factory
(205x60mm)

FORK

RockShox Psylo Gold RC
(160mm)

RockShox Lyrik Ultimate
(160mm)

Fox 36 Factory Grip X2
(160mm)

HEADSET

FSA No.57E

STEM

RaceFace Aeffect R (40mm)

RaceFace Aefect R (40mm)

RaceFace Turbine R (40mm)

HANDLEBAR

RaceFace Chester 35
SM(780x20)
MD/LG/XL(780x35)

RaceFace Turbine
XS(760x20)
SM(780x20)
MD(780x40)
LG/XL/XXL(800x40)

RaceFace Era
SM(780x20)
MD(780x40)
LG/XL(800x40)

GRIPS

ODI Elite Flow Lock-On

SADDLE

SDG Bel Air 3

SDG Bel Air 3 LUX

SEATPOST

SDG Tellis
SM(150mm)
MD(170mm)
LG(200mm)
XL(230mm)

OneUp Dropper Post
XS(120mm)
SM(150mm)
MD(190mm)
LG(210mm)
XL/XXL(240mm)

Fox Transfer Factory
SM(150mm)
MD(180mm)
LG(210mm)
XL(240mm)

BRAKES

SRAM Maven Base

SRAM Maven Silver

Shimano XT M8220 4 Piston

ROTORS

SRAM Centerline (180/200mm)

Shimano RT86 (203mm)

SHIFTER

SRAM Eagle 70 MMX

SRAM Eagle 90 MMX

Shimano XT Di2 SW-M8250-R

DERAILLEUR

SRAM Eagle 70

SRAM Eagle 90

Shimano XT Di2 RD-M8250-SGS

CASSETTE

SRAM XS 1270 (10-52t)

SRAM XS 1275 T-Type (10-52t)

Shimano XT CS-M8200 (10-51t)

CHAIN

SRAM Eagle 70

SRAM GX Eagle Transmission

Shimano XT CN-8100

CRANK

SRAM Eagle 70 DUB
29(30t/165mm)
27.5(32t/165mm)

SRAM Eagle 90 DUB
29(30t/165mm)
27.5(32t/165mm)

Shimano XT FC-8200
29(30t/165mm)
27.5(32t/165mm)

RIMS

WTB ST i30

DT Swiss M 1900 Spline 30

DT Swiss XM 1700 Spline 30

SPOKES

Pillar Double Butted

DT Swiss Champion

DT Swiss Competition Race

HUBS

Novatech D791SB/D902SB

DT Swiss 370 Ratchet LN

DT Swiss 350 Ratchet DEG 72 DF - Anti Kickback

TIRE/FRONT

Maxxis Assegai EXO/TR (2.5)

Maxxis Assegai 3C
MaxxGrip EXO+ (2.5)

Maxxis Assegai
3C MaxxGrip EXO+ (2.5)

Schwalbe Albert, Trail Evo, Ultra Soft (2.5)

TIRE/REAR

Maxxis Minion DHRII EXO/TR (2.4)

Maxxis Minion DHRII
3C MaxxTerra EXO+ (2.4)

Schwalbe Albert, Trail Evo, Soft (2.5)

INCLUDED

Tubeless Valves & Sealant

Shimano Di2 Charger, Tubeless Valves & Sealant

COLOR OPTIONS

	Silver Mist
	Desert Dusk

	Silver Mist
	Desert Dusk

	Silver Mist
	Desert Dusk

	Silver Mist
	Desert Dusk

WEIGHT

32.6 lbs / 14.79 kg (Size MD)

Specs are subject to change at any time. All complete bikes are 95% assembled and packaged for quick and easy final assembly, and as such, Transition Bikes is not able to make special request build spec changes or modifications to packaging.

REFINING THE LEGEND

Now offered in both mixed wheel and dual 29" configurations, the Sentinel gives riders more flexibility to dial in their preferred ride feel, whether that's maximum rollover and speed or a more agile, playful rear end. Overall, it's built as a true "ride-everything" bike for riders who want one setup that can handle a wide range of terrain from everyday trail riding to aggressive, technical descents. It suits riders who value confidence and versatility to keep progressing their skills or just looking for a dependable bike that maximizes fun on every trail.

Dual 29" and Mixed Wheel Configurations

Riders asked, and we listened. The Sentinel is available in a range of wheel sizes across the platform sizes. Stock configurations are as follows: Size XS is dual 27.5, S is mixed, M and L are both dual 29 and mixed, and XL is dual 29. These options best suit riders and their height, but each size can be easily changed to dual 29 or MX to suit the riders preferences.

LEVERAGE CURVES

The leverage curve supports the bike higher in its travel, leaving plenty of room for big hits while keeping it light on its feet to remain nimble and quick everywhere else. This gives it the lively, sporty attitude felt in the Spur and Smuggler without sacrificing its capabilities in rougher terrain.

We did this by balancing a 24% progressive leverage curve with a consistent linear rate of change. Anti-squat is tuned to enhance pedaling performance and acceleration. Overall chain growth is moderate and reduces after sag so chain tension doesn't get in the way of the suspension working.

This translates to killer small bump compliance and great mid-stroke support that gradually transitions into a subtle yet supportive end-of-stroke ramp. The amount of consistent progression is carefully optimized for both air and coil shocks. Riders are able to add or remove volume spacers in air shocks to suite their individual riding style and there is no compromise to bottom out support with coil shocks. The Sentinel has 150mm of rear wheel travel when used with the supplied 205mm x 60mm stroke shock. It is also possible to install a longer stroke shock of 205mm x 65mm to increase the rear wheel travel to 160mm.

REFINING THE LEGEND

Dual 29" and Mixed Wheel Configurations

LEVERAGE CURVES

FEATURES

GEO ADJUST FLIP CHIP

The lower shock mount has a geo-adjust flip chip to accommodate mixed wheels, and features a new design that allows water, dirt and debris to easily wash away. Low for 29" rear wheel, high for 27.5".

B.O.O.M BOX STORAGE

Internal frame storage to hold your burrito, or other munchies. Two supplied bags help store all the essentials for any ride.

CABLE PORTS

Cable ports on the side of the headtube allow for easy and simple cable routing with customizable options for mechanical or wireless shifting as well as left or right rear brake setups. The new port stops cables from getting kinked during a crash and holds them tight to prevent rattling. If you aren't using the port at all, simply cover it with the supplied insert to prevent dirt or water from getting inside your frame and keep a clean aesthetic. These ports help improve the looks of the frame while remaining functional and simple for maintenance.

CHAINSTAY PROTECTION

The chainstay protector minimizes chain slap, so you can enjoy the sound of your favorite turns. The "pillow top" design features large rubber pillows that dampen sound and protect the chainstay.

MUD GUARD

The Sentinel comes with a pre-installed mudguard to protect the main pivot area, improving the bearing life.

ALLOY AND CARBON OPTIONS

The Sentinel is available in both carbon and aluminum, giving riders of any budget and preference their perfect ride.

Speed Balanced Geometry SBG ensures the bike maintains low speed agility, front wheel traction, and proper rider weight balance while actually increasing confidence in steep terrain and at high speeds. With SBG, a slacker head tube angle is combined with a reduced offset fork standard, preventing the front wheel from being too far in front of the rider. This improves front to rear weight distribution on the bike, which is often out of balance on long and slack bikes. One of SBG's greatest benefits is that it creates a confident steering feel that adapts to wheel speed. More stability when going fast, more agility on technical slow speed maneuvering as well as improved traction, control and confidence for any skill level of rider.
	XS 27.5"	SM 29" \| MX	MD 29" \| MX	LG 29" \| MX	XL 29" \| MX	XXL 29" \| MX

A.REACH	415	430 \| 426	455 \| 451	480 \| 476	505 \| 501	530 \| 526

B.STACK	592	615 \| 618	621 \| 624	633 \| 636	642 \| 646	651 \| 655

C.CARBON EFFECTIVE TOPTUBE LENGTH	527	549	577	605	632	660

ALLOY EFFECTIVE TOPTUBE LENGTH	534	557	586	614	642	670

D.SEATTUBE LENGTH	360	360	390	430	460	490

E.CARBON EFFECTIVE SEATTUBE ANGLE	79.8°	79.3° \| 78.9°	78.7° \| 78.3°	78.3° \| 77.9°	77.9° \| 77.5°	77.6° \| 77.2°

ALLOY EFFECTIVE SEATTUBE ANGLE	79.2°	78.7° \| 78.2°	77.9° \| 77.5°	77.3° \| 76.9°	76.8° \| 76.4°	76.5° \| 76.2°

SADDLE HEIGHT FOR EFFECTIVE SEATTUBE ANGLE	560	600	660	720	780	820

CARBON SEATTUBE OFFSET AT BOTTOM BRACKET	69	69	69	69	69	69

ALLOY SEATTUBE OFFSET AT BOTTOM BRACKET	87	87	87	87	87	87

F.HEADTUBE LENGTH	100	100	110	120	130	140

G.HEADTUBE ANGLE	64°	64° \| 63.6°	64° \| 63.6°	64° \| 63.6°	64° \| 63.6°	64° \| 63.6°

H.CARBON CHAINSTAY LENGTH	436	442 \| 440	442 \| 440	448 \| 446	448 \| 446	448 \| 446

ALLOY CHAINSTAY LENGTH	434	442 \| 440	442 \| 440	446 \| 444	446 \| 444	446 \| 444

I.CARBON WHEELBASE	1173	1208	1237	1273	1302	1332

ALLOY WHEELBASE	1171	1208	1237	1271	1300	1330

J.BOTTOM BRACKET DROP	15	25 \| 11	25 \| 11	25 \| 11	25 \| 11	25 \| 11

K.ESTIMATED BOTTOM BRACKET HEIGHT	340	350 \| 344	350 \| 344	350 \| 344	350 \| 344	350 \| 344
All measurements in degrees and millimeters

"The Sentinel V3 remains true to its ride-everything identity while improving its climbing efficiency and responsiveness on low-angle trails. Still a capable descender that can hold its own on when things get gnarly, the Sentinel flourishes most on trails that maximize its maneuverability and fast handling. You tack on the new additions of mixed wheel compatibility, internal storage, updated chain slap protection, reworked cable routing, UDH on carbon frames, and a geometry flip chip, and the Sentinel V3 answers the wants of many past owners. Refined, not redesigned, looks pretty damn good." - Jason Schroeder / Vitalmtb.com

FULL REVIEW

"Since it was first launched, the Sentinel has represented exactly what you want in a trail bike, and the latest version continues the tradition: it's happy to pedal and climb all day long if you need it to, but it's all still in service of the descent. And when that time comes, the Sentinel delivers. Even if you get in a bit over your head, it has you covered. It won't replace the big bike for some, and it isn't pretending to, but it does a great job as a stand in. As far as trail bikes go, the Sentinel keeps its spot high on my list of favourites." - Pete Roggeman / nsmb.com

FULL REVIEW

"I think this bike is for the mountain biker â€” for the purist, the minimalist, the no-nonsense-ist. It's not full of fancy bells and whistles, no marketing gimmicks, no proprietary BS, and despite all that, it's a damn good bicycle. It's a mountain bike with ports to route your damn shifter cables if you want them. It takes that same mentality out to the trails. It goes uphill and downhill and doesn't pigeonhole itself into some tiny little niche. It's happy in all kinds of terrain and never gets in your way. It goes as hard or easy as you'd like, it's just happy to be outside in the woods." - Conor Barry / Bikers Edge

FULL REVIEW

"As far as a summary on the new Sentinel, I am extremely impressed by my first impressions and I'm hard pressed to pick apart a single low point. While many things appeal in terms of the bike's features, it was the improved ride quality - which stems from perfectly refined kinematics and razor sharp geometry - that really won me over." - Ian Collins / MTB-Mag

FULL REVIEW

VITAL MTB NSMB BE BIKES MTB MAG

GENERAL SPECS
FRAME MATERIAL:	Carbon or Alloy

WHEEL SIZE:	29" or MX (XS 27.5" Only)

SIZES:	XS, SM, MD, LG, XL, XXL

COMPONENT COMPATIBILITY
FORK OFFSET:	44mm (XS 37mm)

FORK AXLE-TO-CROWN:	578mm (Includes headset) (XS 560mm)

HEADSET (TOP):	44mm Zero Stack

HEADSET (BOTTOM):	56mm Zero Stack

BB:	73mm BSA Threaded

CHAINGUIDE:	ISCG05

CHAINRING MAXIMUM:	34T Standard Single Ring

CHAINLINE:	52-55mm

REAR BRAKE MOUNT:	180mm Post Mount, Max Rotor Size 223mm

REAR AXLE:	Transition Axle For UDH, 12mm x 148mm Spacing

SEAT CLAMP:	Carbon: 37.0mm Alloy: 34.9mm

SEATPOST DIAMETER:	31.6mm

TIRE MAXIMUM:	29" x 2.5" (*see FAQ)

SUSPENSION SPECS
FRONT TRAVEL:	160mm

REAR TRAVEL:	150mm (Compatible with 160mm)

SHOCK SIZE:	205mm x 60mm (compatible with 205 x 65mm)

SHOCK HARDWARE:	Trunnion Mount Top / 30mm x 8mm Bottom

SAG SETUP:	150mm/60mm: 16-20mm (26-32%)

BEARINGS:	Alloy: 2x 6903, 2x 6902, 4x 6802, 2x 3802, 2x 6900 Carbon: 2x6903, 2x6902, 6x6802, 2x6900

OVERVIEW/BUY

BUILD SPECS

FEATURES

SBG GEOMETRY

REVIEWS

FRAME SPECS

FAQ'S

SUPPORT/SETUP

REFINING THE LEGEND

Dual 29" and Mixed Wheel Configurations

LEVERAGE CURVES

REFINING THE LEGEND

Dual 29" and Mixed Wheel Configurations

LEVERAGE CURVES

GEO ADJUST FLIP CHIP

B.O.O.M BOX STORAGE

CABLE PORTS

CHAINSTAY PROTECTION

MUD GUARD

ALLOY AND CARBON OPTIONS

Transition Sentinel Enduro/Trail Mountain Bike

REFINING THE LEGEND

Dual 29" and Mixed Wheel Configurations

LEVERAGE CURVES

REFINING THE LEGEND

Dual 29" and Mixed Wheel Configurations

LEVERAGE CURVES

GEO ADJUST FLIP CHIP

B.O.O.M BOX STORAGE

CABLE PORTS

CHAINSTAY PROTECTION

MUD GUARD

ALLOY AND CARBON OPTIONS