For nearly a decade, the SB130 and SB140 were among the most important models in Yeti’s lineup. Now, the manufacturer is ushering its trail bike into a new era. The new MT not only takes over the role of the SB140 but also bids farewell to its Switch-Infinity rear triangle. Replacing it is Sixfinity, with which Yeti is extending the platform—originally developed for e-mountain bikes—to its classic mountain bikes.

The history of Sixfinity dates back to 2016. Initial prototypes were followed in 2019 by a carbon trail bike, before the system went into production for the first time in the 160e. Later, Yeti used the Downhill World Cup as a development platform. The developers gathered further insights using a “Super Mule,” on which they tested, among other things, different chainstay lengths, bottom bracket heights, head tube angles, and reach values.

Six joints create adjustability

The heart of the MT is the Sixfinity rear triangle. Its six joints allow Yeti to fine-tune three key parameters largely independently of one another: pedaling efficiency, braking behavior, and shock ratio. A high anti-squat value in the sag range is designed to ensure pedaling efficiency, while this value drops significantly as travel increases, giving the rear triangle more freedom of movement on descents.

At the same time, Yeti has reduced the anti-rise values compared to the SB140. This is intended to keep the rear end more active during braking without altering the geometry too drastically. The goal is greater traction and predictable behavior during hard impacts under heavy braking load.

On the MT, 140 millimeters of rear suspension travel is paired with a fork offering 160 millimeters of travel. A flip chip also allows the rear suspension’s progression to be adjusted in three stages: 10, 15, or 20 percent. The geometry, as well as the anti-squat and anti-rise values, remain unaffected. This allows the character of the suspension to be adjusted without altering the bike’s fundamental balance.

Yeti tunes each size individually

When it comes to geometry, Yeti also departs from the principle of simply scaling a frame up or down. Kinematics and component positioning are adjusted separately for each frame size. To achieve this, the chainstays increase in length with the frame size, ranging from 436 to 452 millimeters. The head angle is consistently 64.5 degrees, and the effective seat angle is 77 degrees. The reach ranges from 430 to 505 millimeters.

The MT is available exclusively with the high-quality TURQ carbon frame. Vectran fibers are designed to increase impact resistance, while Yeti also promises high stiffness and vibration-damping performance.

Another new feature is a storage compartment in the down tube. It has room for tools, a tube, or snacks. A specially designed frame bag keeps the contents in place, and a wraparound rubber seal protects against dirt and water. Hidden mounts for AirTag or Tile trackers are also located beneath the compartment. The cables run internally through molded cable channels, while a new chainstay guard is designed to provide peace of mind.

Five models start at 6,200 francs

Yeti offers the MT in several trim levels and in the colors Turq, Gunmetal, and Redrum. The top-of-the-line model with SRAM XX AXS costs 10,500 Swiss francs and weighs 14.351 kilograms, according to the manufacturer. Below that are variants with SRAM X0 AXS for 8,800 Swiss francs and Shimano XT Di2 starting at 8,300 Swiss francs, among others.

The entry-level model starts at 6,200 Swiss francs. With this, Yeti continues to clearly position the MT in the premium segment. Technically, however, the leap is significantly greater than with a typical model refresh: With Sixfinity, the trail bike gets a completely new rear triangle and adopts the platform on which Yeti will build a significant portion of its mountain bike lineup in the future.

yeticycles.com/mt