Merida eOne-Forty 500

The Merida eOne-Forty 500 is a full-suspension trail bike for riders who want a motor's help on the climbs without giving up capable suspension on the way back down. It sits within Merida's aluminium eONE-FORTY trail range, positioned below the longer-travel eONE-SIXTY and eONE-EIGHTY models, which makes it the pick for riders after assisted trail riding rather than the biggest travel Merida builds. What makes it worth a closer look is that Merida currently lists two distinct 500 builds in the UK, badged EP8 and EP6 after their motors, and the equipment gap between them is wide enough that it's worth understanding before you weigh up any live offer.

EP8 or EP6: two builds under one name

Both builds share the same eONE-FORTY LITE III aluminium frame, so the difference isn't the platform, it's what's bolted to it. The EP8 build is the more capable spec: Shimano's EP8 motor, a Marzocchi Z2 eMTB+ air fork, Shimano Deore 11-speed shifting and Shimano's own four-piston brakes. The EP6 build swaps in Shimano's less powerful EP6 motor, a Suntour XCR34 fork and rear shock, a lower-spec Deore M5120 derailleur and Tektro brakes in place of Shimano's stoppers. Neither is a leftover from a previous year here, both are current, but they're aimed at different budgets and different expectations of how the bike performs on technical ground. If you're comparing prices for 'the eOne-Forty 500', check which motor, fork and brakes a listing actually specifies before assuming you're comparing like for like.

Motor and battery: what powers the climbs

On the EP8 build, Shimano's EP8 motor delivers 85Nm of torque, a genuinely strong output for hauling a loaded trail bike up steep, technical climbs rather than just flat towpaths. Battery capacity on this build depends on frame size: size S gets a 504Wh battery, while M, L, XL and XXL all get a larger 630Wh pack. That's worth knowing if you're torn between two sizes for fit reasons, because it also changes how much charge you're carrying up the hill. The EP6 build uses Shimano's EP6 motor, a step down in output from the EP8, paired with an internal battery from Trendpower; its capacity isn't stated in the applicable UK listing, so if all-day range matters to you specifically on this build, that's a detail worth pinning down before choosing it over the EP8.

Suspension, brakes and tyres on the EP8 build

The EP8 build runs 140mm of travel at the front through a Marzocchi Z2 eMTB+ fork built for the extra mass of an e-MTB, with 133mm at the rear via an SR Suntour EDGE shock. That's proper trail travel rather than the shorter-travel compromise you'd find on a hardtail. It also runs mixed wheel sizes, a 29in front wheel for rollover and stability paired with a 27.5in rear for agility, both wrapped in Maxxis Rekon tyres chosen for trail grip rather than road efficiency. Braking comes from Shimano's four-piston M4100 brakes with 203mm rotors front and rear, a genuinely trail-focused spec that gives you the stopping power to match the extra speed and weight an e-MTB carries downhill. One thing worth flagging if you're planning to go tubeless: the fitted rims are described as tubeless-ready, but the tape and valves needed to actually run tubeless aren't included, so budget for that separately if it matters to you. The EP6 build's suspension and braking come from Suntour and Tektro respectively, a more modest spec that will do the job but doesn't match the EP8 build's componentry.

Sizing: what's actually published

The EP8 build is listed in five sizes, S through XXL, with full geometry published for each: reach runs from 410mm in the smallest size up to 489mm in the largest, alongside stack, wheelbase and standover figures for every size. The EP6 build, by contrast, is only listed in M and XL. Neither build comes with a published rider-height or inseam recommendation, so the geometry numbers are useful for comparing frame sizes against each other but they aren't a substitute for working out what actually fits you.

Because the two builds differ right down to the motor and brakes rather than just paint or wheels, buying on the '500' badge alone risks ending up with less bike than you expected for the money. Treating the EP8 and EP6 as two separate purchasing decisions under one shared name is the safer way to shop this bike.