Light-assist bikes are e-mountain bikes with a subtle boost and plenty of feel – they support you without taking over. No bulky down tube, no shuttle-like riding sensation, no extra weight. Instead: sporty handling, a sleek appearance – and a level of assistance so subtle that you sometimes almost forget it’s there.
If you rip trails on a regular basis, you know the drill: home loop, post-work laps, favorite trail. And in the end? Still turning right – like always. Not because we lack motivation, but because we’re efficient. We know what works. And how long the legs will last.
A light-assistance eMTB doesn’t flip that script – but it nudges the boundaries. It won’t make us better. But it gives us more wiggle room. More energy for that extra climb after the actual ride. More drive to cut through the snowfield instead of skirting around it. And more guts to take the other turn for once.
Innsbruck and the Thing About That Extra Loop
Our half-day tour around Innsbruck says it all: 1,400 vertical meters, a solid 40 kilometers, some brutal terrain, hike-a-bike sections, and snowfields included. New options at every turn. On a regular bike? More like a full-on project. On a full-power eMTB? Definitely doable, but with a battery brick and lots of watts. On light-assistance bikes like the Canyon Spectral:ONfly and the Trek Slash+ – both powered by TQ: a blast! Light enough to carry without a fuss. Subtle enough to forget it’s even there. And efficient enough to still have energy left for an extra round – or just to hang out with the innkeeper on that remote mountain hut. He wasn’t exactly Mr. Friendly at first, but loosened up noticeably once hops entered the conversation. In the end, he even threw in a few beers on the house – maybe because we didn’t quite fit the usual e-bike cliché and basically halved the average age up there. Cheers, cool innkeeper!
Between Worlds – And Right Where it Belongs
“Wait a second!” some of our most observant readers might say. “Didn’t you just declare the end of light eMTBs?” We did – and we stand by it. Classic light-assistance bikes with small batteries and reduced motor power (lightweight at all costs) will likely end up as a niche. That’s backed up by the latest trend survey from our sister mag E-MOUNTAINBIKE: over 40% of participants say that they don’t need a light bike anymore – because full-power eMTBs have become light enough.
But at the same time – and this is no contradiction – most riders don’t just want “more, bigger, badder” either. What they want is a bike that matches their personal needs and fitness level. Which means: as light, agile, and playful as possible – and not necessarily with the most powerful motor. Because they rarely ride in the highest support mode anyway. Not because they couldn’t – but because they don’t need to.
So while old-school light eMTBs might be history, the light-assist concept still has a loyal – and often pretty fit – fan base. But it has clearly evolved. No longer just a tool for “as light as possible,” it now lives in modern bikes that are light, capable, and built for fun.
About the Bikes
On our tour around Innsbruck, we had two authentic ‘two-wheeled pin-ups’ with us – bikes that perfectly represent what today’s light-assist models are all about:
2025 Trek Slash+ – A High-pivot Beast With a Sensitive Side
20.9 kg in size L | € 11,999.00 | Manufacturer’s Website
Trek are taking light-assistance seriously: the new Slash+ combines 170 mm of enduro travel, a TQ HPR50 motor, and – for the first time – a 580 Wh battery, which can be optionally expanded to 740 Wh. The result is a bike that’s built for the rough stuff, with a motor that works discretely in the background. The high-pivot rear suspension delivers plenty of composure and tons of grip, while the intuitive handling inspires huge amounts of confidence from the get go. Sure, the Slash+ tips the scales at a solid 20.9 kg, but in return it offers downhill performance in spades – plus a surprisingly quiet ride feel. If you’re into enduro riding but don’t want to rely on shuttles and lifts, this is a seriously well-rounded package. Bonus points: in the top-tier spec variant, it’s actually slightly cheaper than its analog sibling. For the full lowdown, check out our in-depth review of the 2025 Trek Slash+.
2025 Canyon SpectralON:fly – Light, Playful, Powerful
19.6 kg in size M with Range Extender | € 8,999.00 | Manufacturer’s Website
With the Spectral:ONfly, Canyon introduced a sporty light-assistance eMTB that’s aimed at trail enthusiasts – 160/150 mm of travel, full carbon frame, TQ HPR50 motor and a 360 Wh battery with optional 160 Wh range extender. In its top-tier spec variant, it weighs just 18.6 kg (without the range extender) and stands out with smart features like the K.I.S. steering stabilizer and Canyon’s Connected app for a dialed-in setup. On the trail, it impresses with intuitive handling, a confident ride feel, and a natural, quiet drive unit. It’s not a shuttle replacement, but a bike for riders who actually enjoy pedaling. A strong overall package with a playful character that handles flowy trails just as well as rough descents. Our in-depth review of the Canyon Spectral:ONfly 2025 also shows that you can really go full throttle with it.
Between Silence and Song
Anyone who’s ridden a truly good light-assistance bike knows the feeling: it’s there – but never in your face. No humming, no pushing, no “I got this.” The motor stays in the background like a good wingman: it’s there when you need it, but never steals the spotlight. That’s the real magic – you ride almost like you always do. Just more often. And a little different. The bike sings instead of howling. Instead of making you feel like you’ve got an elevator under your saddle, it’s more like hitting the trails on one of those rare, damn good days – with a gentle breeze of tailwind, strong legs, and sky-high stoke.
Climbing? The trail feels shorter. Hike-a-bike? The weight’s barely an issue. And on the way down? It’s business as usual (some even like those extra kilos compared to a non-motorized bike) – only this time, we’re riding down somewhere completely different. Because we climbed up somewhere we wouldn’t have before.
So the bike doesn’t do the work for you. It just makes more possible. It doesn’t replace the need to put in effort. But it gives you a boost right when it counts. And it does all that without turning your setup into a battery tank that makes you question whether it still deserves to be called a “bike.”
There are these moments on the trail when we all hesitate. A path that branches off into the unknown. It looks longer, steeper, maybe just a bit too wild for today. And that’s when you’re likely to think: “Not now, maybe tomorrow.” A light-assistance bike steps in right then and says, “Why not?” Not loudly, and without being pushy – it’s more like a quiet nod. And without overthinking it, we just turn left.
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Words: Jonny Grapentin Photos: Peter Walker
About the Author
Jonny Grapentin
Jonny Grapentin is an editor at 41 Publishing for E-MOUNTAINBIKE and DOWNTOWN. His background as a publisher in digital education explains his didactically grounded approach. He is responsible for "The MIRROR" column, focusing on development logic and the long-term relevance of products beyond launch cycles. His expertise lies in evaluating technological innovation and everyday utility, which he demonstrates in his numerous product tests. Whether it’s kids' bikes, pizza ovens, or espresso machines, he consistently tests innovations for real-world value, and critically questions market trends.
