Manufacturer range claims are a useful starting point and a terrible planning tool. A Sherman L stating "150km range" in the spec sheet will do roughly 95-115 miles in UK conditions with an 80kg rider, more in summer, less in winter, and significantly less if you actually push it. This page sets out the real maths: how to calculate expected range from your wheel's watt-hour rating, which variables cut range the hardest, and why the number on the box is never the number on your odometer.

The core formula

EUC range is a function of two numbers: your battery's usable energy in watt-hours, and your ride's average energy consumption in watt-hours per mile.

Range (miles) = Battery Wh × usable fraction / average Wh per mile

The usable fraction is typically 0.85-0.90. You do not run a battery flat (cells drop below safe voltage and lose lifetime capacity), so plan on using 85% of rated capacity. A 2000Wh pack gives you around 1700Wh of usable energy in realistic planning.

Average Wh per mile is where the real variables live. A light rider cruising on flat tarmac at 15mph might use 18-22 Wh/mile. A heavier rider pushing 30mph into a headwind on hills might use 45-55 Wh/mile. The range of plausible values is nearly 3x depending on conditions.

What determines Wh per mile

Rider weight

The dominant factor. Energy to push mass against friction and up gradients scales roughly linearly with weight. A 70kg rider uses around 25 Wh/mile at moderate speed on flat ground. A 100kg rider on the same ride uses 32-35 Wh/mile. Every 10kg of rider or cargo adds roughly 10% to consumption.

Speed

Aerodynamic drag scales with the square of velocity. Doubling speed from 15mph to 30mph quadruples the drag force and nearly triples the energy consumption per mile. This is why slow touring rides extract maximum range and fast rides empty the battery fast.

Rough consumption figures for an 80kg rider on flat tarmac:

15mph cruise: 22-26 Wh/mile
20mph cruise: 28-32 Wh/mile
25mph cruise: 35-40 Wh/mile
30mph cruise: 42-48 Wh/mile
35mph cruise: 52-60 Wh/mile

Terrain and gradient

Hills cost energy that you do not get back. Regenerative braking recovers perhaps 15-25% of the energy you spent climbing, never more, because the hub motor is not an efficient generator. A 5% sustained climb for 5 miles can add 25-40% to your ride consumption.

Surface matters. Smooth tarmac is the baseline. Rough concrete, gravel and hard-packed trail add 15-25% to rolling resistance. Loose sand and wet grass add 40-60%. Off-road miles cost dramatically more per mile than road miles.

Temperature

Lithium-ion battery capacity falls in cold weather because cell internal resistance rises and chemical reactions slow. Rough figures:

20-25°C (optimal): 100% of rated capacity
10°C: 90-95%
5°C: 85-90%
0°C: 75-85%
Below zero: 60-75% (falls fast below -5°C)

This is why January range tests give very different results from July range tests on the same wheel. A Sherman L that does 110 miles on a 22°C July day does 75-85 miles on a 2°C January morning.

Wind

Headwind matters more than most riders realise. A 15mph headwind on a 20mph cruise is effectively 35mph drag at the same power output. Energy consumption can jump 50-80%. Tailwinds save a smaller fraction because drag is already low at lower effective speeds.

Tyre pressure

Under-inflated tyres add 10-20% to rolling resistance. Check pressures weekly. Recommended pressure varies by wheel and weight; typically 35-45 PSI for commuter wheels, 25-40 PSI for off-road tyres depending on terrain.

Battery age

Lithium-ion cells lose capacity with cycles and calendar time. Samsung 50S cells (common in premium wheels) retain about 80% of original capacity after 500 full-charge cycles. A 2000Wh pack that started at 2000Wh will do 1600Wh at 500 cycles, which translates to roughly 20% less range. Fast-charging hardware accelerates degradation; slow overnight charging preserves cells.

Battery chemistry: what cells your wheel uses

Cell chemistry determines capacity, discharge rate and lifetime. Current high-quality EUCs use:

Samsung INR21700-50S

5Ah capacity, 25A continuous discharge. The premium performance cell. Used in Leaperkim Sherman L, Patton, Inmotion V13. Balances capacity and high-current delivery well. Expected 500-700 cycles to 80% capacity.

LG M50LT

5Ah capacity, 10A discharge. Higher capacity per cell than 50S but lower current capability. Used where range matters more than peak power.

Molicel P42A

4.2Ah capacity, 45A discharge. Lower capacity but very high power delivery. Used in Begode performance wheels where peak wattage is the priority.

Panasonic NCR21700

Varies by sub-type. Common in older packs, generally being displaced by Samsung and LG equivalents.

Older 18650 cells

Wheels pre-2022 often use 18650 cells rather than 21700. These have lower capacity per cell and worse thermal properties. If buying used, check cell format: 21700 is future-proof, 18650 is aging.

Worked examples

Example 1: Sherman L, commuter scenario

Wheel: Leaperkim Sherman L, 3600Wh pack (Samsung 50S cells).
Rider: 85kg, plus 3kg backpack.
Conditions: 12°C autumn day, mixed tarmac commute, rolling hills, 20mph average.

Usable energy: 3600 × 0.87 = 3132 Wh.
Base consumption at 20mph for 88kg rider: 33 Wh/mile.
Temperature adjustment (12°C): multiply available energy by 0.93 = 2913 Wh effective.
Terrain adjustment (rolling hills): +12% consumption = 37 Wh/mile.
Predicted range: 2913 / 37 = 78-80 miles.

Real-world community reports for Sherman L in this scenario: 75-85 miles. Model matches reality.

Example 2: Leaperkim Lynx, weekend trail ride

Wheel: Leaperkim Lynx, 2000Wh pack.
Rider: 75kg, full gear ~82kg total.
Conditions: 8°C winter morning, private forest trails, hard-pack with some mud, 15mph average.

Usable energy: 2000 × 0.87 = 1740 Wh.
Base consumption at 15mph for 82kg rider: 24 Wh/mile.
Temperature adjustment (8°C): multiply by 0.90 = 1566 Wh effective.
Terrain adjustment (trail, some mud): +30% = 31 Wh/mile.
Predicted range: 1566 / 31 = 50-52 miles.

Community reports for Lynx in trail conditions: 45-55 miles. Model matches.

Example 3: Inmotion P6, urban commuter

Wheel: Inmotion P6, 750Wh pack.
Rider: 72kg, light clothing.
Conditions: 18°C spring day, smooth tarmac private cycle path, 18mph average.

Usable energy: 750 × 0.87 = 652 Wh.
Base consumption at 18mph for 72kg rider: 24 Wh/mile.
Temperature adjustment (18°C): no penalty = 652 Wh effective.
Terrain adjustment (flat smooth): baseline = 24 Wh/mile.
Predicted range: 652 / 24 = 27 miles.

Manufacturer claim for P6 is 35 miles. Community reality in good conditions is 22-28 miles. Model matches community, not marketing.

Example 4: Sherman L, worst-case January ride

Same wheel and rider as Example 1. Different day.
Conditions: 1°C January morning, hilly route, 25mph average, 10mph headwind on the outbound leg.

Usable energy: 3600 × 0.87 = 3132 Wh.
Base consumption at 25mph for 88kg rider: 40 Wh/mile.
Temperature adjustment (1°C): multiply by 0.78 = 2443 Wh effective.
Terrain adjustment (hills): +15% = 46 Wh/mile.
Wind adjustment (headwind half the ride): +25% consumption average = 58 Wh/mile.
Predicted range: 2443 / 58 = 42 miles.

Same wheel, same rider, different day: half the range of Example 1. This is why January planning should halve your summer expectations.

Cold weather penalty in detail

Below freezing the maths breaks into two parts. First, the cells themselves deliver less energy per Ah because internal resistance rises and lithium movement slows. Second, the battery management system (BMS) limits discharge current to protect cells at low temperature, which can trigger early tiltback and power reduction.

Practical cold-weather habits for the UK:

Keep the wheel indoors before a ride. A 20°C battery starting the ride will self-warm enough to hold decent performance for the first 20 minutes; a 2°C battery will not.
Start gentle. The first 5 miles cost disproportionate energy as the pack warms.
Assume 25-35% less range than your summer baseline.
Do not charge a very cold battery immediately. Let it warm to room temperature before plugging in.

Why manufacturer range is inflated

Manufacturer test conditions typically assume:

60-65kg test rider
Flat, smooth, closed circuit
15-18mph constant cruise (lowest-consumption speed band)
20-25°C ambient temperature
Fresh battery at 100%, test to full cutoff
New tyres at optimal pressure
No wind

Change any one of these and the claimed figure stops matching reality. Change all of them for a UK winter commute and the manufacturer number is 40-50% higher than what you will experience. This is not dishonesty so much as selective testing; the same approach every EV manufacturer uses on WLTP figures.

Quick reference: range by wheel size and conditions

Battery Wh	Summer cruise (80kg, 20mph, flat)	Winter cruise (80kg, 20mph, cold)	Hard use (80kg, 30mph, hills)
750Wh (e.g. Inmotion P6)	22-28 mi	15-20 mi	12-15 mi
1500Wh (e.g. S16 Pro)	42-50 mi	30-38 mi	25-32 mi
1800Wh (e.g. X-Way, MSP)	50-60 mi	38-46 mi	30-38 mi
2000Wh (e.g. Lynx)	56-68 mi	42-52 mi	35-42 mi
2220Wh (e.g. V13, S22 Eagle)	60-75 mi	45-56 mi	38-46 mi
3600Wh (e.g. Sherman L, Master V4)	95-115 mi	70-85 mi	55-70 mi
4000Wh (e.g. Patton)	105-125 mi	78-93 mi	62-78 mi

How to estimate your own rides

Start with usable Wh = rated Wh × 0.87.
Look up your rider-weight-and-speed consumption in the figures above (or log your own with a ride-tracking app).
Apply the temperature multiplier.
Apply any terrain/wind adjustment.
Divide usable Wh by adjusted Wh/mile to get predicted range.
Subtract 10-15% safety margin. A range estimate that lands you at 0% battery five miles from home is a range estimate that gets you stranded.

Apps that help

Darkness Bot (iOS) and Euc World (Android) log real consumption per ride. After a month of use your own historical Wh/mile will be more accurate than any general formula. Both apps show live battery voltage, current draw and instantaneous power, which is how you notice range-killing conditions (headwind, cold, heavy throttle) before they empty your pack.

Planning a 50-mile ride

Honest checklist:

Start with full charge. "95% is enough" plus a headwind equals walking.
Know the terrain. Climbing 300m net of elevation adds 5-8 miles of equivalent flat consumption.
Check the forecast. A cold day or 15mph wind changes your plan.
Plan a halfway point with a charger option. Even a slow 2A charge can add 10-15 miles of range in a lunch stop.
Tell someone your route. A stranded EUC rider on private land in winter is a real problem.

When range calculations fail

The formula assumes steady cruise. Real rides are rarely steady. Stop-start riding, aggressive acceleration, long descents (regen is limited and you can overheat the motor controller on sustained downhills), extended full-throttle climbs all push consumption outside the model. If your ride style is aggressive, add another 20% to consumption and plan accordingly.

For the full picture on what wheel to choose and which battery tiers make sense for different use patterns, see the 2026 buyers guide. For the detailed spec comparison of every 2026 model, see the model comparison page.