An e-bike is not a small motorbike — it is an ordinary bicycle with a motor that assists while you pedal. That distinction matters, because it decides who genuinely benefits and who will regret the money. Here are the fundamentals, with numbers.
How they work
A sensor detects that you are pedalling and tells the motor to assist by an amount you choose on the display (usually five levels). Stop pedalling and the assist stops. Some models add a throttle that runs the motor without pedalling — which moves them closer to a moped and shortens battery life.
Motor position: hub or mid-drive?
| Criterion | Hub motor | Mid-drive |
|---|---|---|
| Price | Cheaper | More expensive |
| Climbing performance | Good | Excellent |
| Weight distribution | Rear-biased (less balanced) | Central and low (balanced) |
| Battery consumption | Higher on climbs | More efficient |
| Maintenance | Simpler | Wears the chain faster |
The numbers: what do 250 W and 36 V mean?
- Watts (W) = motor power. 250 W handles flat ground and mild inclines; 350–500 W suits steeper climbs or a heavier rider.
- Volts (V) = battery voltage. 36 V is common; 48 V delivers more torque.
- Amp-hours (Ah) = battery capacity, which sets the range.
- Watt-hours (Wh) = volts × amp-hours. This is the number to compare on. A 36 V × 10 Ah battery is 360 Wh.
Calculating real range
Manufacturers quote an ideal range measured with a light rider on flat ground at the lowest assist level. The practical rule is a consumption of 7–15 Wh per kilometre depending on assist level, weight and wind.
| Assist level | Wh per km | Expected range |
|---|---|---|
| Low (1–2) | ≈ 7 Wh/km | ≈ 50 km |
| Medium (3) | ≈ 10 Wh/km | ≈ 36 km |
| High (4–5) | ≈ 15 Wh/km | ≈ 24 km |
Battery life and how to preserve it
- A lithium battery lasts roughly 500–800 full charge cycles — three to five years of normal use.
- Do not leave it flat for long periods, and do not store it at 100% for months. For long storage, 40–60% is best.
- Avoid charging in extreme heat or straight after a ride — let it cool for half an hour first.
- Use only the supplied charger. Non-matching chargers are a common cause of battery damage and fires.
- The battery is the most expensive part of the bike — ask the price of a replacement before you buy.
Who genuinely benefits
- Someone commuting 10–25 km who does not want to arrive drenched in sweat.
- Someone regularly carrying loads or shopping.
- Someone with a health condition that rules out heavy exertion but who wants to stay active.
- Older riders who want to keep up with friends rather than be left behind.
- Not for: someone whose main goal is burning calories — a normal bike is better and far cheaper.
Does an e-bike need a licence in Egypt?
Pedal-assist e-bikes (motor engages only while pedalling, around 250 W) are generally treated like ordinary bicycles. Rules do change, though, and throttle-equipped, higher-speed models may be classified differently. Check the regulations in force when you buy.
Can I ride it in the rain?
Most e-bikes are splash resistant (IPX4 or better) but not submersible. Never pressure-wash one, do not leave it in heavy rain for hours, and dry the battery contacts after any wet ride.
Is it worth the price difference?
If it replaces a car or public transport for a daily commute, it pays for itself in one or two years. If it is for fitness or occasional leisure, a good normal bike gives more enjoyment for a quarter of the price.
