How Far Can an E-Bike Actually Go?

There is one honest answer and it is arithmetic, not marketing. Take the battery's watt-hours and divide by how much energy you use per kilometre. Most riders on a standard 500 W e-bike use somewhere between 7 and 20 watt-hours per kilometre, so a 720 watt-hour pack works out to roughly 36 km at the hard end and around 100 km at the easy end. Where you land inside that spread is decided almost entirely by how much assist you use, how much you weigh, how cold it is, and how hilly the ride is.

We have not published our own measured range for the Blackrock X1 yet, and we are not going to reprint a factory number in the meantime. That is why the range row on the specifications is blank. When we test it, the figure will be published here with the date, the air temperature, the rider weight, the route, the tire pressure and the assist level, so you can judge whether our conditions look anything like yours.

Do the arithmetic yourself

Start with the size of the pack:

volts × amp-hours = watt-hours

A 36 V 20 Ah pack is 720 Wh. A 48 V 15 Ah pack is also 720 Wh. Same energy, same rough range. Then divide:

watt-hours ÷ watt-hours per kilometre = kilometres

The only variable you have to estimate is the second one. Here is how to place yourself.

Roughly what you use	The kind of riding that produces it	720 Wh gets you about
7 to 9 Wh/km	Lowest assist, mostly pedalling yourself, flat pavement, mild weather, light rider, no cargo, few stops.	80 to 100 km
10 to 13 Wh/km	Middle assist, mixed flat and rolling ground, some stop and start, average rider weight.	55 to 72 km
14 to 17 Wh/km	High assist, hills, headwind, heavier rider or cargo, soft surfaces, cold weather.	42 to 51 km
18 to 22 Wh/km	Throttle much of the time, steep climbs, deep cold, loaded rack, low tire pressure on sand or snow.	33 to 40 km

Those consumption bands are the figures commonly used across the e-bike industry for standard 500 W hub-drive bikes. They are a planning tool, not a test result, and we have labelled them that way on purpose. Your own number will settle down after two or three rides once you see how much of the battery a known route uses.

Working out your real figure after one ride

The most useful thing you can do is measure yourself. Charge to full, ride a route you know the length of, then read the battery gauge.

watt-hours used ÷ kilometres ridden = your Wh/km

If your display shows percentage, multiply the pack size by the percentage used. Using 40 percent of a 720 Wh pack over 30 km is 288 Wh over 30 km, which is 9.6 Wh/km, which means a full charge on that route and that day would take you about 75 km. Write it on a piece of tape on the frame. That number, from your bike with you on it, is worth more than every range claim on the internet put together.

The five things that actually move the number

1. Assist level, by a wide margin

Nothing else comes close. Dropping from the top assist level to the middle one can cut your energy use by a third or more, because the motor is doing less of the work and you are doing more. Throttle-only riding is the most expensive way to travel, because you supply nothing at all. If you want more range, this is the lever, and it is free.

2. Total weight

The motor has to accelerate everything: bike, rider, groceries, tools, panniers. Weight costs you most on hills and at every stop sign, because both mean accelerating the whole mass again from nothing. A rider at 110 kg will not get the same range as a rider at 70 kg on the same bike, and no bike specification ever mentions that.

3. Temperature

Cold takes range away from every lithium battery. Below freezing you should plan on noticeably less, and on a genuinely cold Canadian day closer to half of what the same bike does in summer. The capacity usually comes back when the pack warms up, so this is a planning problem rather than damage. How to handle it is covered in winter riding in Canada.

4. Terrain and surface

Hills are the obvious one. Climbing a hill is work, and the energy for that work comes out of the pack. What catches people out is surface. Soft sand, loose gravel, mud and unpacked snow all cost energy continuously, not just in bursts. So does low tire pressure, which is the price you pay for the float and comfort that fat tires give you. That trade is set out in fat tire vs regular e-bike.

5. Wind and stop-start riding

A steady headwind is a hill that never ends. Air resistance climbs steeply with speed, which is why riding at 32 km/h into a wind drains a battery so much faster than cruising at 22 km/h on a calm day. City riding with a light every block is expensive for the same reason as weight: every stop throws away speed you then have to buy back.

Why manufacturer range claims are close to useless

A "up to 100 km" claim is usually produced under conditions nobody rides in: the lowest assist setting, a flat closed circuit, a light rider, no cargo, no wind, mild temperatures, hard tires, and no stops. It is not necessarily a lie, but it describes a laboratory, not a road in southwestern Ontario in November. Whenever you see a range figure without a temperature, a rider weight and an assist level attached to it, treat it as a marketing number.

The questions to ask instead are: how many watt-hours is the pack, and what were the conditions when you measured. Any seller who can answer both is being straight with you.

How to get more range out of the bike you have

• Use less assist. One level down is the biggest gain available and costs nothing.
• Pump the tires up for pavement. Running fat tires at trail pressure on a paved commute costs real range.
• Use the gears. A 7 speed drivetrain exists so you can keep pedalling efficiently instead of leaning on the motor.
• Keep the battery warm in winter. Store it indoors and fit it just before you leave.
• Slow down a little. Air resistance punishes the last few kilometres per hour hardest.
• Carry a second pack if your route genuinely needs it. A spare 20 Ah battery doubles your usable distance and is the only way to add range to a finished bike. Other parts are in parts and accessories.

What a battery losing range is telling you

If your range drops steadily over years, that is normal ageing. If it drops sharply over a few weeks in mild weather, something is wrong, and the e-bike battery guide covers what to look at and what shortens a pack's life in the first place.

Read next

• E-bike battery guide
• Winter riding in Canada
• Electric bike buying guide