Trek's Slash+ is available in two builds: the mid-range 9.7 with Shimano SLX/XT and the high-end 9.9 with SRAM X0 T-Type.
Reviewers relish the smooth and natural-feeling pedal assist from the compact TQ-HPR50 motor.
The Slash+ has a flip-chip to adjust leverage rate. Reviewers prefer the less progressive stock setting, saying the suspension platform is already supportive enough.
Experts relish the bike's ability to fly off jumps and handle hits with composure while retaining speed.
Reviewers praise the massive support from the highly adjustable RockShox Vivid Ultimate shock and ZEB Ultimate fork (Slash+ 9.9).
The range from the small battery impresses. A 143lb reviewer gets between 27.3 and 34.2 miles with 3,937 to 4,921 feet of elevation gain in various range tests.
Experts feel confident blasting down chunky downhill runs thanks to the rear suspension and balanced geometry.
The Slash+ easily maintains traction and stability through technical uphill sections.
Testers commend the flawless performance of SRAM's X0 Eagle AXS drivetrain and powerful Maven Silver brakes (Slash+ 9.9).
Experts appreciate the increased maneuverability and responsiveness from the mullet 27.5" rear wheel on sizes M to XL.
The easy-to-read top tube display is discreet but informative.
The battery is removable, an uncommon feature in the lightweight e-MTB category.
This bike is shipped already set up tubeless.
The Slash+ frame accepts a 190mm fork.

10 reasons not to buy

Most reviewers recommend immediately replacing the weak Bontrager tires on both builds.
Testers are disappointed by the meager travel of the stock dropper seatpost (170mm in sizes M to XL).
Reviewers agree the motor is underpowered on steep climbs.
Three experts hear unidentified rattles or creaks. One says it's coming from inside the down tube.
Two testers complain the Slash 9.9's BITS steerer tube-integrated multi-tool rattles and is hard to remove.
Reviewers report chain slap caused by the pulley system.
Experts struggle to change tires on the Bontrager Line Pro 30 carbon rims (9.9), blaming the thick rim tape.
A reviewer finds the Slash+ 9.7’s FOX Rhythm 38 suspension fork lacks adjustment and struggles to keep up with the strong Performance Float X shock.
The head tube angle can be adjusted up or down by one degree with headset cups, but they cost extra.
A test bike’s battery fails and requires replacement.

Bottom line

Trek's Slash+ is a lightweight enduro e-MTB with a TQ-HPR50 motor and 560Wh battery. It's available in two builds: Slash+ 9.7 with Shimano and FOX or the higher-end 9.9 with SRAM and RockShox. Experts relish the bike's downhill performance, highlighting the balanced yet aggressive geometry and supportive suspension platform. The traction and stability on climbs impress, but steep gradients are a challenge due to the weak motor. The range and smooth pedal assist earn praise, but noisy bikes, poor tires, and meager dropper travel disappoint. While experts consider the Slash+ a solid performer, they question the value at this price.

Expert Reviews

86/100 based on 3 scored reviews (9 reviews in total)

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Pinkbike

Level 5 expert

Review: Trek’s 2025 Slash+ 9.9 Is a Ridiculously Good Descender

Level 5 expert

The Slash+ is the first e-MTB I’ve ridden that regularly tempts me away from my pedal bikes, thanks to its excellent battery range and confidence-inspiring downhill performance. Though I’d still probably choose the regular Slash if I had to…

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Flow Mountain Bike

Level 5 expert

2025 Trek Slash+ Review | Subtle Motor, Outrageous Suspension Performance

Level 5 expert

With the Slash+ sharing the same kinematics and similar geometry to the regular Slash, its performance on properly rough and technical singletrack is outstanding.

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Wired

Level 1 expert

Review: Trek Slash+ 9.7 SLX/XT Electric Mountain Bike

Level 1 expert

On its weight and handling, Hayden reported that the Slash+ melded substantial power with a surprising lightweight build, noting it had a solid and reassuring connection with the trail and maintained stable flight during jumps.

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BLISTER

Level 3 expert

Trek Slash+

Level 3 expert

The Trek Slash+ is an interesting offering that doesn’t have all that many close peers. On one hand, it offers very forgiving and plush-feeling high-pivot suspension and feels like a big, descending-oriented bike in that respect.

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The Loam Wolf

Level 5 expert

2024 E-MTB Lite Group Review Trek Slash+ 9.9 X0 AXS Review

Level 5 expert

It’s on the heavy side, doesn’t offer the best value on the market, has an underpowered drive unit, but… [the] raucous this bike can handle on the way down the mountain makes up for the pain on the way up.

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AMB

Level 5 expert

Trek Slash+ 2025 Review | An E-Bike in Disguise?

Level 5 expert

My time on the Trek Slash+ has been great… I do love this bike, but due to its smaller motor and less torque, I would not choose it as an e-enduro race bike.

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NSMB

Level 5 expert

The New Trek Slash+

Level 5 expert

… this is an especially fun bike in the steep, chunky terrain it was designed for, but it doesn’t wallow or feel like a barge in mellower terrain – the motor helps with that for sure.

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E-MOUNTAINBIKE

Level 5 expert

2025 Trek Slash+ on Review – A New Enduro E-MTB With TQ Motor and Big Battery

Level 5 expert

The Slash+ excels on fast, rough terrain, inspiring huge amounts of confidence in the process. However, don’t expect a shuttle service on the climbs. While the Slash+ is steady and enduring uphill, it’s not particularly fast…

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BIKE Magazin

Level 5 expert

Trek Slash+ 9.7 in Review [German]

Level 5 expert

The Trek Slash+ 9.7 benefits from its responsive rear suspension and balanced trail handling… It’s a shame: the basic fork and tires significantly limit the bike’s potential.

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