Merida eONE-FORTY 400

About the Merida eONE-FORTY 400

The eONE-FORTY 400 sits in that sweet spot where trail capability meets all-day stamina. Merida's built this around their LITE aluminium frame - borrowed geometry from their trail and enduro platforms - and paired it with Shimano's EP801 motor and a 630Wh battery that you can pop out yourself when it needs charging. It's not chasing podiums or trying to be the lightest thing on the car park; instead, it's aimed squarely at riders who want to cover more ground, tackle steeper climbs without the suffer-fest, and still have enough in the legs to enjoy the descent.

What makes this bike tick is the balance. You get 150 millimetres of travel up front from the SR Suntour Zeron 36X fork and 143 millimetres out back via Merida's FAST kinematic suspension, which keeps things composed without feeling over-damped or wallowy. The frame uses an intube battery design that keeps the centre of gravity low, and there's a flip chip if you fancy experimenting with a mullet setup - 29-inch front, 27.5-inch rear - or sticking with full 29ers for momentum and roll-over. Merida's AGILOMETER sizing system lets you pick a frame length based on how you like your bike to behave: shorter for quick, flickable handling, longer for planted stability at speed.

On trail, the eONE-FORTY 400 feels lively rather than lumbering. The steeper seat angle plants you over the bottom bracket on climbs, keeping the front wheel honest even when the gradient kicks up, and the motor's smooth delivery means you're not fighting sudden surges or dead spots. Descending, the bike stays playful - easy to manual, happy to pop off lips, and composed enough through rough sections that you're not constantly wrestling the bars. It's not an enduro sled, but it's more than capable when the trail gets rowdy.

Merida eONE-FORTY 400 geometry

Merida's drawn on their trail and enduro lineage here, and it shows in how the bike sits under you. The reach figures span a sensible range across the AGILOMETER sizes - XShort through to XLong - so whether you're after a more upright, nimble feel or a stretched-out, stable stance, there's a frame that'll fit. The head angle is slack enough to inspire confidence when the trail pitches down, but not so slack that you're fighting the bike through tighter, twistier sections or feeling vague at lower speeds.

That steeper seat angle is the key to the climbing manners. It shifts your weight forward, keeping traction on the front tyre and stopping the bike from feeling like it's trying to loop out when you're grinding up technical climbs. The low standover height makes it easy to get a leg down quickly, and the relatively low bottom bracket keeps the bike feeling planted rather than tall and tippy. Stack is generous enough that you're not folded over the bars, which matters when you're spending hours in the saddle and want to arrive at the top of the climb without a crick in your neck.

The flip chip adds another layer of adjustability. Run it in the 29er setting and you get maximum roll-over and momentum; flip it to mullet and the rear end quickens up, making the bike feel snappier in tight corners and easier to throw around. It's not a night-and-day transformation, but it's enough to tailor the ride to your local trails or your mood on any given weekend.

Component choices & upgrades

The stock build on the eONE-FORTY 400 is sensibly specced for the price point. Shimano's CUES U6000 ten-speed drivetrain offers an 11-48T cassette that's wide enough for steep climbs and fast fire roads, and the SRAM DB4 four-piston brakes deliver plenty of stopping power without needing constant bleeding or pad swaps. The SR Suntour Zeron 36X fork and Edge Plus shock are both air-sprung with lockout and platform damping, so you've got the basics covered for tuning the suspension to your weight and riding style.

Maxxis rubber front and rear - Minion DHF up front, Forekaster out back - gives you a sensible balance of grip and rolling speed. The DHF is a known quantity for front-end confidence, and the Forekaster keeps things efficient without being skittish. Merida's own-brand cockpit components - 780-millimetre bars, short stem, dropper post with travel that scales with frame size - are functional and durable, if not particularly flashy.

If you're riding harder terrain or your skills have outgrown the stock kit, there are logical upgrade paths. A fork with more sophisticated damping - something like a RockShox Pike or Fox 36 - will give you better small-bump sensitivity and more control through rough, high-speed sections. The rear shock could step up to a Fox Float or RockShox Deluxe for finer tuning and more consistent performance across longer descents. If you're chasing weight savings or want sharper shifting, a twelve-speed drivetrain from Shimano or SRAM would be the next move, though the ten-speed CUES setup is perfectly adequate for most riders.

Tyres are always a personal choice. If you're riding looser, drier conditions, you might swap the Forekaster rear for a Rekon or Dissector; if it's wetter and muddier, a Minion DHR II or Assegai rear would add security. The stock wheels are tubeless-ready with a 28-millimetre internal width, so you've got room to experiment with tyre volume and pressure without needing to replace the rims straight away.

Where the Merida eONE-FORTY 400 excels

This bike is built for trail riding in its truest sense: mixed terrain, varied gradients, all-day adventures where you want to cover distance without arriving home completely cooked. The motor and battery combination means you can tackle longer loops or steeper climbs than you might manage on an acoustic bike, and the suspension travel is enough to handle rough descents without feeling out of its depth. It's outstanding at keeping you comfortable and confident across a wide range of trails, from flowing singletrack to rockier, more technical sections.

It also does well as a rugged partner for less conventional rides - think bridleways, forest roads, even the odd urban shortcut where full suspension and e-assist make light work of kerbs and potholes. The user-removable battery is a practical touch if you're commuting or need to charge indoors, and the frame's durability means it'll shrug off the kind of knocks and scrapes that come with regular use.

Where it's not ideal is at the extremes. If you're chasing enduro race times or spending most of your rides on steep, gnarly descents, you'll want more travel and a slacker, more aggressive geometry - something like Merida's own eONE-SIXTY or a dedicated enduro e-bike. Equally, if you're after the lightest possible setup for XC racing or fast, smooth trails, the eONE-FORTY 400's weight and travel will feel like overkill. It's a generalist, and that means it won't be the absolute best at any one thing, but it'll be very good at most things most riders want to do.

Merida eONE-FORTY 400 FAQs

What is the battery range of the Merida eONE-FORTY 400?
The 630Wh battery offers solid range for most trail rides, though exact distance depends on terrain, rider weight, assist mode, and how much climbing you're doing. Expect anywhere from 40 to 80 kilometres in mixed conditions, with longer range in Eco mode and shorter if you're hammering the motor on steep climbs. The removable design means you can carry a spare or charge it separately.

Is the Merida eONE-FORTY 400 suitable for beginners?
It's a capable bike that'll grow with your skills, but it's not the lightest or simplest option for someone brand new to mountain biking. The motor makes climbs easier and can mask some technique gaps, which is helpful, but the bike's travel and geometry are aimed at riders who'll actually use that capability on varied terrain. If you're starting out and know you want to ride proper trails rather than gentle paths, it's a solid choice.

What are the best tyres for the Merida eONE-FORTY 400?
The stock Maxxis Minion DHF front and Forekaster rear are a sensible pairing for mixed conditions. If you're riding drier, harder-packed trails, a Rekon or Dissector rear will roll faster; for wetter, muddier conditions, a Minion DHR II or Assegai rear adds grip. Front tyre choice is more personal - some riders prefer a High Roller II or Assegai for extra security, but the DHF is hard to fault.

How does the AGILOMETER sizing system work on Merida bikes?
Instead of traditional small, medium, large, Merida uses XShort through to XLong to describe frame sizes based on reach and handling character. Shorter frames are quicker and more playful; longer frames are more stable and planted at speed. You pick based on your height and how you like your bike to feel, rather than just matching a size chart. It's a more nuanced approach that acknowledges not everyone of the same height wants the same ride.

What is the difference between the Merida eONE-FORTY and eONE-SIXTY?
The eONE-SIXTY has more travel - 160 millimetres front and rear - and a slacker, more enduro-focused geometry. It's built for steeper, rougher descents and more aggressive riding, whereas the eONE-FORTY is lighter, more efficient on climbs, and better suited to general trail riding and longer adventures. If you're spending most of your time descending, the eONE-SIXTY makes sense; if you want a more balanced, versatile bike, the eONE-FORTY is the better call.

Can I fit a range extender to the Merida eONE-FORTY 400?
Shimano offers range extenders for the EP801 motor system, and the eONE-FORTY frame has bottle bosses that can accommodate one. It adds weight and changes the bike's balance slightly, but if you're planning very long rides or multi-day adventures, it's a practical option. Check compatibility with your specific model year before buying.

What is the recommended maintenance for the Merida eONE-FORTY 400?
Regular cleaning and lubrication of the chain and drivetrain, checking brake pads and rotor condition, and keeping the suspension seals clean are the basics. The motor and battery need minimal maintenance beyond keeping the contacts clean and ensuring firmware is up to date. Service the fork and shock annually or after heavy use, and check spoke tension and wheel true regularly. The threaded bottom bracket and internal cable routing make home maintenance straightforward.