Orbea Denna M40

The Denna M40 is Orbea's answer for a drop-bar rider who wants proper motor assistance without giving up a purpose-built gravel frame. It pairs a carbon platform with a Shimano EP801 motor tuned specifically for road and gravel use, so the appeal here isn't just "an e-bike with drop bars" but a bike built from the ground up to help you go further and climb more on the mixed-surface routes this kind of riding usually involves.

A carbon platform for road, gravel and moderate trails

Orbea rates the Denna carbon platform to ASTM Condition 2, which in plain terms means it's designed for paved roads, unpaved roads and moderate, non-technical trails rather than the rowdier off-road terrain a full-suspension mountain bike is built to survive. The rigid, full-carbon fork reinforces that intent: this is a bike for covering distance across varied surfaces, not one aimed at technical singletrack. If your riding mostly means lanes, towpaths, forest roads and the odd loose descent, that's exactly the brief it's built for. If you're picturing rockier, more technical trails, you'd be better served by a bike designed and tested for that use.

How the motor and battery work together

The EP801 motor runs Orbea's own RS Gen2 RC tuning rather than a generic Shimano map, with separate Gravel and Gravel+ assist profiles: the standard setting favours range for longer days, while Gravel+ is aimed at looser, steeper sections where you want more support underfoot. Torque can be adjusted up to 85Nm through Shimano's E-Tube app, so you can lean the bike towards efficiency or towards climbing muscle depending on the ride ahead. The 420Wh battery is the practical limit on how far that assistance stretches, and Orbea's own estimate is up to 3,500m of climbing for an average rider. Treat that as a planning figure rather than a promise: your actual result will depend on which assist profile you use, how much luggage you're carrying, the terrain, the temperature and how hard you're pedalling alongside the motor.

Kit built for mixed-surface distance riding

Shifting is handled by mechanical Shimano Cues, an 11-speed groupset with an 11-50t cassette and 44t chainring, giving a wide enough spread of gears to keep spinning up loaded climbs once the motor's assistance tapers off. Shimano RS405 hydraulic disc brakes provide the stopping power you want given the extra weight a motor and battery add to any bike. The fitted Pirelli Cinturato Gravel H tyres come in a 700×45c size, and Orbea's frame will accept tyres up to 50c, so there's real scope to move to something wider and more cushioned if you find yourself riding rougher tracks regularly. A frame bag comes fitted as standard, which is a genuinely useful bit of kit for a bike aimed at longer days: somewhere for tools, snacks or a packable layer without strapping on extra bags. One thing worth flagging plainly: mudguards and a front light aren't part of the listed standard equipment, so if you're planning on wet-weather or after-dark commuting, budget for adding your own.

Choosing your size and the right offer

The Denna M40 spans six sizes from XS to XXL, and a Denna-specific height guide is the most useful starting point for narrowing down which one suits you, since Orbea's own size chart doesn't publish height bands directly. The geometry figures used to compare reach, stack and standover across those sizes come from the shared Denna carbon platform rather than an M40-specific table, so they're a solid guide to fit rather than a bike-specific measurement unique to this build. One practical note for anyone comparing offers: UK listings carrying different year labels don't necessarily share the same equipment. The current manufacturer configuration is the reference point described here, but an older-labelled UK offer has been seen with different tyres fitted, so it's worth checking the actual component list on any specific offer rather than assuming a year label tells you everything about the build.

For day-long routes where you want to carry what you need without reaching for panniers, having that frame bag built in from the start is a small but genuinely useful piece of this bike's character, and it says something about the kind of long, self-sufficient riding the Denna M40 is aimed at.