E-bike specification glossary — what every number means

Common values: 36V (budget/low-power), 48V (standard Pakistani scheme bikes), 60V (higher power/speed). A 48V system can typically reach 40–45 km/h; a 60V system can reach 55–65 km/h depending on controller limits. Voltage does not directly affect range — that depends on Ah capacity.

Multiply voltage × Ah to get watt-hours (Wh), the true energy measure. A 48V 26Ah pack = 1,248 Wh. A 48V 20Ah pack = 960 Wh. The higher the Ah, the more range. For Pakistani commuting (20–30 km/day), a 20Ah pack is adequate; for longer routes or hilly terrain, 26Ah+ is better.

Wh = Voltage × Ah. Two bikes with different voltage/Ah combinations but the same Wh will have similar real-world range (all else equal). Use Wh to compare batteries with different voltages fairly. A 500Wh pack will typically give 40–60 km real-world range in city conditions.

250W motors meet the legal limit in many countries and handle flat city roads at 25–35 km/h. 500W motors give better acceleration and handle gentle slopes. 1,000W+ motors are for cargo loads, steep hills, or high speeds (55–70 km/h range). Government scheme bikes in Pakistan range from 350W to 1,000W. Higher wattage uses more electricity — shorter range.

A motor rated 500W nominal might peak at 1,000W for short bursts (starting from a standstill or going up a steep incline). Always compare nominal power ratings, not peak, to get a fair comparison between bikes. Dealers sometimes advertise peak power — ask for the nominal figure.

Advertised range is always measured under ideal conditions: light rider, flat road, 25 km/h constant speed. Real-world range in Pakistan is typically 60–75% of advertised range. Key factors: rider weight, speed, traffic (stop-start drains more), temperature, terrain, battery age, and throttle use vs pedalling. Always plan based on 65% of the advertised figure.

Depends on battery capacity and charger amperage. A standard 2A charger takes 6–8 hours for a 48V 26Ah pack. A 5A fast charger does the same in 3–4 hours but generates more heat and shortens battery life if used daily. Avoid charging from below 10% or above 95% every single day — charge to 80–90% for daily use to extend battery life.

The BMS monitors each cell, prevents overcharging, prevents over-discharging (which damages Li-ion cells permanently), balances cells for even wear, and shuts down if temperature is dangerous. A quality BMS is the single biggest factor in long battery life. Government scheme bikes should have an active BMS — confirm with the dealer before buying.

PAS uses a cadence or torque sensor to detect pedalling and deliver proportional motor assistance. Level 1 PAS gives light assistance; level 5 gives maximum. Most Pakistani government scheme bikes are throttle-only (twist/thumb throttle), not PAS. True PAS bikes are more efficient — the rider's pedalling reduces load on the battery — but are less common in the Pakistani market.

Two types: twist throttle (like a motorcycle) and thumb throttle (pressed with the thumb). Both send a signal to the controller to deliver power. Full throttle from standstill drains the battery faster and stresses the motor — apply gradually for better range. Throttle-only bikes are common in Pakistan; they feel like riding a light electric motorcycle.

Format: IP followed by two digits. First digit (0–6): dust protection (6 = dust-tight). Second digit (0–8): water protection (4 = splashing, 5 = water jets, 7 = 1m submersion, 8 = deeper). For Pakistan: IP54 is minimum for light rain; IP65 is recommended for monsoon riding; IP67 is ideal if you ride through flooded roads. Check the battery IP rating specifically — the motor is usually well-sealed but battery connectors can be vulnerable.

Measured in Newton-metres (Nm). Higher torque means stronger acceleration from standstill and better low-speed hill climbing. A 250W hub motor typically produces 20–40 Nm. A 1,000W motor can produce 80–120 Nm. For Pakistani city riding (frequent traffic stops), more torque improves daily comfort even more than higher top speed.

Controllers are rated in amps (e.g., 15A, 25A, 45A). A 48V 25A controller can deliver 1,200W peak. Higher amperage = more power available but also faster battery drain. Controller quality affects smooth power delivery and motor longevity. A mismatched controller (too high amp) can burn a motor over time.

Hub motors on e-bikes can sometimes regen-brake — when braking, the motor resists, slowing the bike and charging the battery slightly. The energy recovered is typically 5–15% of riding energy in city conditions — it adds a small range boost and reduces brake pad wear. Not all Pakistani scheme bikes have this feature; it is worth asking about.