Electric bike range: Wh, elevation gain, weight and calculating real-world kilometres

Range

An electric bike's range cannot be judged by kilometres alone. Two 40 km routes can use very different amounts of energy: one flat with a good surface, the other with 1,400 m of climbing, mud, cold and soft tires. Looking only at the catalogue figure means buying blind.

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What Wh means

Wh describes the energy available in the battery. An 800 Wh battery stores more energy than a 600 Wh one, but that does not always mean 33% more riding. If the bike weighs more, you fit more aggressive tires or use more assistance, some of that advantage is lost.

The biggest drains on your battery

Climbing is the biggest energy drain. Next come rider and kit weight, assistance mode, tire pressure, casing, compound, temperature, wind and cadence. An eMTB with soft tires in mud can use far more energy than the same bike on a hardpacked track.

A practical calculation before you ride

For an unfamiliar route, do not promise kilometres: calculate a reserve. If your bike has 800 Wh and you know you use around 12-18 Wh/km on mixed terrain, that gives you an indication. But if there is substantial climbing, also think in Wh per 100 m of ascent. With a heavy eMTB, long climbs and high assistance, consumption rises quickly.

My practical advice: finish your first rides with battery to spare and record the details. Distance, elevation gain, temperature, mode and percentage remaining. After three rides, you will have real data for your bike, not a marketing figure.

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Tire pressure and drivetrain condition matter too

A tire with a stiff casing at the right pressure rolls differently from a supple casing at low pressure. I am not saying you should ride rock-hard tires; I am saying not to turn your bike into a tractor if range is the priority. A dry or dirty drivetrain also wastes energy, and on an eMTB that is more noticeable because the motor amplifies everything.

Battery care without obsessing

• Do not store the battery for months at 100% or 0%.
• Avoid leaving the bike charging indefinitely when it is unnecessary.
• Expect less range in very cold conditions.
• Use original or recognized compatible charger.
• Do not blast connectors with a pressure washer.
• If range drops unusually, have the system diagnosed.

Good range is not about getting home with an empty battery and an epic story. It is about arriving with a reserve, without anxiety and knowing the bike will respond consistently at the end of the ride.