Trek Slash Gen 6

The Trek Slash's 29-inch front wheel plows over obstacles, while the 27.5-inch rear wheel provides more agility and bike-to-butt clearance.

Trek Slash Gen 6 Bike Review

The all-new Trek Slash is beefed up in celebration of its sixth iteration.

This fresh design features an oversized, 19-tooth idler pulley and a high-pivot rear suspension configuration for the first time in the model’s lineage. Travel has been increased to 170 millimeters, pushing it further into the all-out, winch-and-plummet ethos that so many enduro bikes seem to be gravitating to. Our 9.9 version was spec’d with Bontrager’s RSL integrated handlebar and stem, a SRAM T-Type XO drivetrain, and the all-new RockShox Vivid Ultimate rear shock.

The previous Slash was an impressive bike. It was impressively light for an enduro bike and was surprisingly efficient to pedal around all day. The new Slash Gen 6 leans more heavily toward the chairlift and shuttle culture side of the mountain bike world with some extra heft and additional pulleys in the drivetrain. However, with the oversized pulley and lighter casing tires, I found the Slash to climb the most efficiently of any high-pivot bike I’ve reviewed thus far. I attribute this mostly to the large, 19-tooth upper idler.

Bike Geometry & Specs

Model: Slash Gen 6
Price: $9,399.99
Wheel Size: 29"/27.5"
Rear Travel: 170mm
Fork: 170mm
Wheelbase: 1277mm
Chainstay: 434.2mm
Reach: 488mm
Head Tube Angle: 63.3

The new Slash continues to use the tried-and-true Horst link design for its rear suspension.
SRAM's new Transmission derailleurs are sleek and refined; they also represent a huge step forward in the overall durability of the modern mountain bike rear derailleur.
The 19-tooth upper idler eliminates pedal kickback caused by chain growth, while the lower idler prevents the chain from tugging on the derailleur cage.

Further, the Slash has a flat anti-squat curve. That is to say, the bike rides squish-free when hammering out of the pedals. Speaking to Trek's product marketing manager, Ross Rushin, about this she said, "Having just the right amount of anti-squat in the system makes this long-travel bike pedal more like a short-travel bike, but don’t worry, there’s nothing short-feeling about it on the way back down." So, the seated position of the bike is fantastic despite having a shorter chainstay length of around 434 millimeters on our size Large mixed-wheel model. The bike keeps your weight firmly between the wheels while climbing steep grades. Despite the (tolerable) extra drag on the climb, you can at least remain well-balanced and comfortable.

Of course, a bike like this isn’t intended for those looking for the utmost in climbing efficiency.  The altered rear axle path that effectively elongates a high-pivot bike’s wheelbase when the rear suspension is compressed is where the chunk-eating magic comes from. The Slash certainly delivers in this regard. Even with a 27.5-inch rear wheel, the Slash provided a surprisingly smooth ride on the roughest trails during the summer dry season. This stout Trek feels most at home when mobbing straight into technical, chunky terrain at high speed. On the first few rides, I felt slightly unsettled by the bike. At first, I thought the feeling might be a potential side effect of the changing wheelbase of the bike. But, after slowing down the rebound on the fluttery Vivid Ultimate, I felt much readier to be on the attack while riding. The Slash does retain an agile quality that I really enjoy, and I was surprised at its ability to tackle slow speed and flat, technical terrain—as well as tight corners—with gusto.

The new RockShox Zeb Ultimate is fitted with the Charger 3 RC2 damper with vibration-killing ButterCup technology.
The Gen 6 Slash can be fitted with angle-adjust cups to change the headtube angle.
SRAM's wireless Pod controllers are customizable and much smaller than the previous wireless AXS shifters.

"The steeper and chunkier the better, going up or down."—Ross Rushin: Product Marketing Manager at Trek Bikes

The spec of our 9.9 XO build performed flawlessly. The SRAM X0 Eagle AXS T-Type drivetrain is slow to shift but feels very secure under load, and the Pod shifter is an excellent ergonomic solution to wireless shifting. The new Code Silver Stealth brakes provide a much more discernible bite point and good overall power than the previous version. The new Vivid Ultimate felt nice and very active—the suspension’s ability to track at high speed was predictable and smooth. I never felt any noticeable bottom-outs, even when running the Vivid’s sag at 40 percent.

The new SRAM Code Silver Stealth brakes provide a much more discernible bite point and more overall power than the previous version.
The integrated carbon armor applies an additional layer of protection with an impact-resistant film underneath the paint.
The updated internal storage has a larger opening and easier-to-reach latch.

The new Slash is a bold step in a new direction. It is definitely not a bike I would take on a 6,000-foot backcountry loop with my fit friends, but it adds even more ability to charge through fast, straight-line chunk than the already-capable previous version. This ultra-high capability suspension also serves to reduce arm fatigue during huge descents. The new Slash is a standout option for riders looking for a high-pivot setup.