How to Compare Electric Bikes — Motor, Battery, Range and Features Explained
To an average person, two electric bikes can appear nearly indistinguishable in photographs and be priced roughly the same; however, when it comes to their performance on the road, they turn out to ride nothing like each other. This difference can often be explained by the technical specifications. In order to compare electric bikes, you must be aware of what is truly important.
This guide walks through the specifications worth checking side by side, so you can look at two listings and actually understand what separates them.
Start With the Motor: Power and Torque
Each listing boasts about the wattage, but rated motor power alone reveals less than you might expect. For e-bikes that meet the UK’s electrically assisted pedal cycle (EAPC) requirements, the motor’s maximum continuous rated power is limited to 250W. That means that when you’re comparing UK-road-legal EAPCs, the wattage figure alone won’t tell you much.
Torque is the actual figure that defines how well a bike will climb and accelerate. One bike with 45 Nm is noticeably easier to accelerate from a stationary position compared to another producing 100Nm despite the fact that they may have equal power rating of 250W. Higher torque generally means stronger hill starts and a punchier feel when you pull away from a stop.
Hub Motor or Mid-Drive?
Where the motor sits on the bike changes how it delivers that torque. A hub motor drives the wheel directly and tends to be simpler and cheaper. A mid-drive motor sits near the pedals and pushes power through the gears, which usually makes for a more natural climbing feel on steep or varied terrain.
We’ve covered this properly in our mid-drive vs hub motor guide, so we won’t repeat all of it here. For electric bike specifications comparisons, just knowing which type you’re looking at explains a lot of the other differences you’ll see on the spec sheet.
Torque Sensor or Cadence Sensor?
Other than motor location, see what sets off the assist. The torque sensor reacts to your effort when pedalling the bike. This is more similar to biking without any assistance. The cadence sensor works based on rotation of the pedals. This is more akin to switching something on and off. There isn’t necessarily a better one between the two, but it’s good to know.
Battery Capacity and Watt-Hours
Electric bike battery comparisons are usually listed as voltage and amp-hours, like 36V 15.6Ah, but the number that lets you compare batteries fairly is watt-hours (Wh), found by multiplying the two together. A 36V 15.6Ah battery works out to roughly 562Wh, while a 48V 15Ah battery comes to 720Wh. Two batteries with completely different voltage and amp-hour figures can still be directly compared once you convert them to Wh.
Claimed Range vs Real-World Range
Every manufacturer publishes a maximum range figure, and it’s worth treating that number as a ceiling rather than an expectation. It’s usually measured on flat ground, at the lowest assistance setting, with a lighter-than-average rider.
Real-world range on hillier UK roads at a higher assistance level typically comes in noticeably below the claimed figure. We’ve gone into this properly in our dedicated guide on real-world e-bike range, so treat the number on a spec sheet as a starting point for comparison rather than a guarantee.
Weight and How It Affects Handling
Electric bike features worth comparing don’t stop at the motor and battery. Weight matters more than most buyers expect, particularly if you’ll be lifting the bike onto a rack, carrying it up steps, or storing it somewhere without ground floor access. A 25kg commuter bike and a 33kg full-suspension folder both ride fine once you’re moving, but they feel very different the moment you’re not.
Wheels, Tyres and Suspension
Wheel size affects how a bike rolls over kerbs, potholes and general UK road surfaces, with larger wheels generally rolling more smoothly over rough ground. Tyre width adds grip and comfort at the cost of a bit of extra rolling resistance. Suspension, where fitted, ranges from a basic front fork that takes the edge off potholes to full front and rear suspension that absorbs considerably more vibration on rough or unpaved routes.
Brakes and Gearing
When it comes to disc brakes, regardless of whether they are mechanical or hydraulic, they are the standard and should always be considered when buying an electric bicycle, given the added weight.
Typically, hydraulic brakes are known to be better since they offer a firmer grip and less hand effort, especially on extended downhills. Gears are another important component. A wider gear range gives you more flexibility across hills and flat stretches, so it’s worth checking how many speeds a bike offers rather than assuming pedal assist alone will smooth everything out.
Removable Batteries and Folding Designs
Having a removable battery means you can charge indoors without the need to bring the entire bike inside, which can be very helpful if the bike is placed somewhere where a power plug socket isn’t accessible. Folding designs trade a bit of frame rigidity and often some suspension travel for the ability to fit in a car boot, a train luggage rack or a small flat. Neither feature is strictly better; it depends entirely on where you’re keeping the bike and how you plan to move it around.
Frame Type and Warranty
Step-through frames make mounting and dismounting easier and suit riders who want to swing a leg over without lifting it high, while step-over frames tend to be slightly stiffer. Warranty length and what it actually covers, particularly the battery and motor, is worth checking directly rather than assuming, since coverage varies a lot between brands and sometimes between components on the same bike.
Included Accessories and Intended Use
Some bikes come equipped with mudguards, a rear rack, lights, and a lock, while others treat those as extras you’ll need to buy separately. This should be taken into consideration when making your price comparison. Similarly, it is also important to consider the purpose for which the bike was made. For instance, a commuter bike intended for smooth road riding and a rugged bike with a rack installed solve different issues despite having similar statistics.
Electric Bike Comparison —Putting Two Spec Sheets Side by Side
Here’s what this looks like in practice, using the Touroll B1 and the ENGWE Engine Pro 3.0 Boost.
| Specification | Touroll B1 | ENGWE Engine Pro 3.0 Boost | Why it matters |
| Motor | 250W rear hub | 250W rear hub with torque sensor | Torque sensor gives more natural, effort-based assistance |
| Torque | 45Nm | 90Nm | Affects hill starts and how punchy acceleration feels |
| Battery | 561.6Wh | 720Wh | Higher capacity generally supports longer rides |
| Claimed range | Up to 90km | Up to 130km | Manufacturer maximum, real-world range will be lower |
| Gearing | 7-speed Shimano | 7-speed Shimano Tourney | Similar range of flexibility across hills and flat roads |
| Suspension | Front only | Front and rear | Rear suspension matters more on rough or uneven surfaces |
| Folding | No | Yes | Affects storage and whether it fits in a car boot or on a train |
| Weight | Approx. 25kg | 34.7kg | Heavier bike takes more effort to lift, carry or store |
On paper both use a 250W hub motor, but the torque figure, sensor type, suspension setup and battery size point to genuinely different riders. The Touroll B1 suits a straightforward commute on mostly flat, familiar roads at a lower price.
The ENGWE Engine Pro 3.0 Boost suits someone wanting stronger torque, a torque sensor’s more natural feel, and the option to fold the bike away, and willing to pay considerably more for it. Neither bike is better in the abstract, they’re just built for different jobs, which is exactly what a side-by-side comparison is meant to reveal.
Comparing With Confidence
Once you have figured out your needs, two spec sheets stop being an incomprehensible pile of numbers and become two different solutions to the same question of what it is that you really need in a bike. If you prefer to have all these details laid out in a simplified form, check out this Compare E-Bikes tool. It puts model specifications side by side so you can check the numbers that matter most to you directly.
Still narrowing things down? Our E-Bike Quiz is a quick way to point yourself towards the right type of bike before you start comparing individual models.
Frequently Asked Questions
What To Look For When Comparing Electric Bikes?
Focus on motor torque rather than just wattage, battery capacity in watt-hours, whether the motor is a hub or mid-drive, and the type of pedal sensor used. Weight, brakes, suspension and gearing matter too, but those four tend to separate bikes the most.
How Do I Compare Electric Bike Batteries Fairly?
To convert the volts and amp-hours to watt-hours, simply multiply them. This way, you get a single number that is easily comparable rather than having two dissimilar numbers that might mean the same thing.
Is a Higher Wattage Motor Always Better?
This is not always the case, especially in the UK, where most e-bikes that are legally classified only have motors up to 250 watts anyway. Torque, rather than watts, is a better measure of performance when going up hills and starting from a standstill.
Why Do Two Electric Bikes With Similar Specs Feel So Different to Ride?
The small discrepancies between torque figures, motor location, sensors, and the type of suspension system can make a huge difference in performance despite appearing very similar in numbers on paper. This is precisely the reason why a comparison of the full specification sheet is more important than individual numbers alone.
