2018 Transition Sentinel Alloy NX Bike TR Blue

There ain't no feelin, like big wheelin', that's a fact.

We know that here at Twelve50, however, there are always riders quick to dismiss the wagon wheelers and the Transition Sentinel was designed to prove those 29er haters wrong. A bike so capable, playful and fun that even the most staunch 29er naysayer will instantly convert.

With Transition's reverse mullet suspension configuration (got to love a reverse mullet, right), the Sentinel stays responsive and playful while delivering incredible downhill monster truck capabilities. The game changing new Speed Balanced Geometry is the crown jewel that unlocks 100% of the potential of this bike. With SBG you get total confidence  - the Sentinel is on rails in the corners, destroys steep tech and climbs better than it has any right too. It's one hell of a bike!

The NX Build Kit brings together a solid set of components offering a great mix of performance, durability and value. It's ready to shred straight out of the box!

The MTB press have been falling over theselves to heap praise on the Sentinel. Below are just a couple of exerts from the reviews so far.

"If there's a design-focused arms race occurring in mountain biking, one needs look no further than Transition as a key protagonist in the current push toward ever-longer and more-aggressive geometry. it should come as absolutely no surprise that the Sentinel is most at home bombing downhill. It does this ridiculously well, straight-lining the roughest, ugliest, sketchiest descents with a supreme confidence that borders on disdain." - The Bike Bible Review

"The Sentinel is an absolute beast when it comes time to descend, a downright monster when the trail turns steep and rough. There are plenty of long-travel 29ers out there that can handle the Whistler Bike Park, but when it comes to tackling the steepest, chunkiest trails there aren't many that can match the Sentinel's performance. " - Mike Kazimer (Pinkbike.com) -

Sizing Chart

3 Year Got Your Back Warranty

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 all new 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 manoeuvring as well as improved traction, control and confidence for any skill level of rider.

Learn more about SBG