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

The Sentinel was designed for 29er skeptics. A bike so capable, playful and fun that even the most staunch 29er naysayer will instantly convert. With our reverse mullet suspension configuration, the Sentinel stays responsive and playful while delivering incredible downhill monster truck capabilities. Our Speed Balanced Geometry is the crown jewel that unlocks 100% of the potential of this bike. With SBG you get improved climbing and cornering traction along with incredible composure and control that won't flinch when you open it up on steep, fast, technical descents.

Transition SENTINEL Frameset

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.

MSRP	$2,999
Where to Buy	— $1 At
Category	Enduro
Weight	6.8 lbs (frame)

Frame


Wheels
Wheel Size	29″
	Hydraulic Disc



Drivetrain
Brand Site	transitionbikes.com
Summary	The Transition SENTINEL Frameset is a 29″ full suspension enduro frameset.

Shock	205mm x 57.5mm
Bottom Bracket	73mm BSA Threaded
Headset	44mm Zero Stack (Top) / 56mm Zero Stack (Bottom)
Seatpost	31.6mm Type: Rigid

Front Derailleur	No Support
Brakes	180mm Post Mount Type: Hydraulic Disc