Neither one, by itself. On an e-bike, range is set by the average power you draw from the battery, not by whether you ask for that power with a throttle or with pedal assist. Grin Technologies (ebikes.ca), the Vancouver lab behind the Cycle Analyst, puts it plainly: range depends mainly on average power drawn, not on the control type. A throttle only feels thirstier because it makes it effortless to hold a high power level while your legs contribute nothing. Change how hard the motor works and you change your range — the lever you pull is almost incidental.
That is the short answer. Below is the arithmetic behind it, what it means for a Sydney commute, and the part most riders get wrong: in NSW, a throttle is legally a walk-assist button, not a riding mode.
Does a throttle drain an e-bike battery faster than pedal assist?
Start with the only equation that matters. Energy in a pack is watt-hours = volts × amp-hours. The Cyberbikes Centauro runs a 48V 25Ah Samsung pack, which its spec sheet lists as 1200Wh. Power is watts = volts × amps. Divide the first by the second and you get hours; multiply by speed and you get kilometres. Everything else is detail.
So the real question is: what sets the average wattage? That depends on what the controller is listening to.
- Throttle. You are commanding the controller directly. Hold it wide open and the controller will deliver up to its battery-current limit for as long as the pack allows, whether or not your legs are moving.
- Basic cadence PAS. ebikes.ca is blunt about what this sensor knows: the controller “only knows how fast you are spinning the cranks” and cannot sense how hard you push. In a constant-power mode, the lab’s own example is that with assist set to 200 watts “you would have received the same 200 watts of boost” regardless of speed or terrain.
- Torque-sensing PAS. Here the motor is tied to your effort. In a torque-multiplier scheme, ebikes.ca explains, “If you pedal twice as hard you get twice as much power,” with typical ratios around 1:1 or 2:1.
Now the arithmetic bites. Suppose you ride a torque-sensing setup at 2:1 and put 100 watts through the pedals — an easy, conversational effort. The motor adds roughly 200 watts, so the pack is supplying about 200W. On a 1200Wh battery that is six hours of running. Hold a throttle at 600W instead and the same pack lasts two hours. Same battery, same bike, same rider — one third of the time in the saddle.
That is the honest version of “a throttle uses more battery”. It does not use more because throttles are inefficient. It uses more because nothing stops you asking for 600W on a flat road where 200W would have done.
Is a throttle legal on an e-bike in NSW?
This is where the Australian answer diverges sharply from the American one, and it is worth getting exactly right. Read live from Transport for NSW as at October 2026:
- 500W maximum continuous rated power — dropping to 250W from 1 March 2029, when only EN 15194 certified e-bikes will be allowed on NSW roads.
- Pedal assistance must cut out at 25 km/h. Above that, the motor contributes nothing.
- A throttle that powers the bike without pedalling must cut out at 6 km/h. Throttle-only operation above 6 km/h makes the bike illegal.
- Exceeding any limit makes the bike illegal even if an app, switch or software restricts it. Since 21 August 2026, NSW Police and authorised officers have expanded powers to seize non-compliant e-bikes.
Read that again, because it reframes the whole comparison. In NSW you are not choosing between “ride on the throttle” and “ride on pedal assist”. You are choosing between a 6 km/h walk-assist button — genuinely useful for shoving a loaded cargo bike up a driveway or out of a lift — and pedal assist for everything else. Any bike sold here that will hold 25 km/h on the throttle alone is not a legal e-bike, however it is advertised.
The Centauro is built to that line: its spec sheet lists pedal assist cutting out at 25 km/h, throttle limited to 6 km/h, a 250W continuous rear hub motor, UL 2849 and UL 2271 certification and an ISO 4210 frame. If you want the full picture of the rules, our complete guide to e-bike laws in NSW covers helmets, paths and penalties.
Why does holding a throttle up a hill cook the motor?
Battery drain is the question riders ask. Heat is the one that actually destroys hardware, and it is where throttle habits do real damage.
Current flowing through the motor’s copper windings produces most of its internal heat, and that heat scales with the square of the current. ebikes.ca spells out the consequence: double the current and the heat from the copper increases “by a factor of FOUR”. Their page on motor power ratings goes further and names the real culprit: “it’s not the output power but the output torque of the motor which causes it to heat up and eventually fail.”
Torque peaks when the motor is turning slowly and fighting hard — which is exactly what happens when you crawl up a hill on the throttle at walking pace. Below the speed where peak power occurs, the controller is current-limited and clamping the electrical input, so you are pouring in amps and getting very little road speed back. The lab’s worked example is sobering: one MXUS hub motor “will eventually reach 100°C with just 800 watts of output power” at 250 RPM, and thermal equilibrium can take “upwards of 1-2 hours”. Good windings can survive the 150–180°C range, but nobody sane rates a motor continuously there.
Pedalling is not just exercise, then. Every watt your legs put into the chain is a watt the motor does not have to produce as torque, and therefore as heat. On a long Sydney climb — the pull up from Iron Cove, or the back streets above Leichhardt — a rider spinning a low gear with assist on will reach the top with a cooler motor than a rider holding a throttle in a high gear, even if both arrive at the same time.
Which control gives better Wh/km on a Sydney commute?
Work in watt-hours per kilometre and the comparison becomes concrete. The Centauro’s published figures — 1200Wh, and up to 120 km at 25 km/h on flat road with a 75 kg rider and no headwind — work out to roughly 10 Wh/km in those conditions. That is the benchmark to measure yourself against, not a promise: hills, headwind, stop-start traffic and a heavier load all push it up.
| Control | What the controller responds to | What sets your draw | NSW status |
|---|---|---|---|
| Throttle | Your thumb or twist grip | Entirely your right hand | Must cut out at 6 km/h |
| Cadence PAS | Crank rotation speed only | The assist level you selected | Legal to 25 km/h |
| Torque-sensing PAS | How hard you push the pedals | Your legs, multiplied | Legal to 25 km/h |
A 10 km each-way commute — 20 km return — at roughly 10 Wh/km is about 200Wh, a sixth of a 1200Wh pack. Ride the same 20 km leaning on maximum assist into a headwind and you might spend double that. The control type barely moves the number; the assist level and the terrain move it enormously. If you want the deeper mechanics behind all of this, start with our guide to how e-bikes actually work: motors, sensors and controllers.
So which should you actually choose?
Three practical points, and they are not the ones the marketing copy makes.
Stop-start traffic favours direct control. ebikes.ca notes that basic PAS can be unsuitable in stop-and-go city riding, where automatic power arrives as motor bursts at unwanted moments. Anyone who has pulled away from the lights on Parramatta Road with a cadence sensor two magnets behind their legs knows the feeling.
Long rides favour pedal assist. The lab’s stated main benefit of PAS is hand comfort — you are not holding a lever for an hour.
You do not have to choose. A PAS setup and a throttle can coexist on the same bike; the Centauro ships with both, within the 6 km/h and 25 km/h limits the law sets. Use the throttle as what NSW intends it to be: a walking-pace helper for manoeuvring a 37 kg bike. Use assist for riding.
At our Leichhardt workshop the single most common cause of a “my range collapsed” complaint is not the control type at all. It is a rider who moved from assist level 2 to assist level 5 when the weather turned, and never moved back.
See how the 25 km/h assist limit plays out on the road
Frequently asked questions
Does pedal assist charge the battery while you pedal?
No. Pedalling on a standard pedal-assist e-bike puts mechanical power into the chain and the rear wheel, not electrical energy into the pack. It extends your range by reducing how many watts the motor has to supply, not by generating any. Only a motor with a regeneration mode returns energy to the battery, and then only while braking or descending.
Is a throttle illegal on an e-bike in NSW?
A throttle itself is not illegal, but it must cut out at 6 km/h. Transport for NSW states that a throttle which powers the bike without pedalling above 6 km/h makes the bike illegal. A legal NSW e-bike also has a maximum continuous rated power of 500W, dropping to 250W from 1 March 2029, and pedal assistance that stops at 25 km/h.
Does a torque sensor give more range than a cadence sensor?
Usually, but indirectly. A torque sensor ties motor output to your effort, so a rider who pedals genuinely will draw fewer average watts than one holding a fixed high assist level. ebikes.ca notes that range depends mainly on average power drawn rather than on the control type, and that torque-based assist raises the share of propulsion coming from your legs only if you would not otherwise have pedalled hard.
Try both controls before you commit
Reading about thumb throttles and torque sensors tells you far less than two minutes of riding does. Book a test ride at Cyberbikes Leichhardt, 281 Parramatta Road, and feel the difference between a cadence pulse and a torque multiplier on the same bike. We are open Tuesday to Saturday — call 0491 794 668 — or browse the range at cyberbikes.com.
Prefer to spread the cost? Ask us about rent-to-own from $99 a week.
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