Shoppers compare e-bikes on watts and battery size because those numbers are easy to put in a table. But the part of the ride you actually feel — whether the assist kicks in smoothly under your pedal stroke or lurches on like a switch — comes from a spec that rarely makes the headline: the sensor. This guide covers what a torque sensor and a cadence sensor each measure, why that difference matters more than an extra 100 watts, and what to ask before you buy.
In this guide
- What a torque sensor and a cadence sensor each measure
- Why sensor type affects ride feel more than wattage
- Real numbers: how this shows up across bikes
- What to ask before you buy
- Frequently asked questions
What a torque sensor and a cadence sensor each measure
A cadence sensor is the simpler of the two. It sits near the crank and detects one thing: whether the pedals are turning, and roughly how fast. Once it sees rotation, it tells the motor to deliver a preset level of assist for whichever power setting you've selected — the same push whether you're spinning gently on flat ground or grinding up a hill. It's inexpensive to build and reliable, which is why it shows up on a lot of entry-level and budget e-bikes.
A torque sensor measures something different: how hard you're actually pushing on the pedals, in real time, and scales the motor's assist to match. Pedal lightly and the motor adds a little; push hard into a climb and it adds more, proportionally, following your effort rather than a fixed schedule. The Air Max uses an 85 Nm bilateral torque sensor paired with its 750W motor (900W peak) for exactly this reason — so power arrives in proportion to how hard you're actually pedaling instead of switching on at a flat rate.
Why sensor type affects ride feel more than wattage
Two bikes can post similar wattage numbers and still ride completely differently, because wattage only tells you how much power the motor can deliver — not how intelligently it decides when to deliver it. A cadence-sensor bike tends to feel a beat behind your pedal stroke: you start pedaling, there's a short lag, then the assist arrives all at once, which can feel like a mild shove rather than a boost. Ease off and the same thing happens in reverse. On climbs or in stop-and-go city riding, that on/off rhythm gets tiring to manage.
A torque-sensor bike tracks your effort continuously, so the assist rises and falls with your own pedaling rather than snapping between states. The practical difference shows up most in exactly the situations regular commuters hit every day: starting from a dead stop at a light, modulating power through a climb, or feathering the throttle-free assist through slow traffic. It's also why we don't oversell watts alone — our own e-bike buying checklist lists motor power and sensor type as one combined checklist item, not two separate bragging rights, because a high-watt cadence-sensor motor can still feel less refined than a lower-watt torque-sensor one.
Real numbers: how this shows up across bikes
Sensor type isn't tied to price or brand tier in any consistent way — you'll find torque sensors on bikes at a range of price points, which is exactly why it's worth checking per-bike rather than assuming. In our own lightweight e-bike roundup, the Aventon Soltera.2 is built around a 350W hub motor with a torque sensor as its whole pitch — a clean, no-throttle commuter where pedaling effort is the main input. The Air Max sits at a different point on the spec sheet — a 750W motor (900W peak) with an 85 Nm bilateral torque sensor, paired with a 921.6 Wh dual-battery system built for distance rather than a minimalist setup.
| Bike | Motor | Sensor type |
|---|---|---|
| Mihogo Air Max | 750W (900W peak) | 85 Nm bilateral torque sensor |
| Aventon Soltera.2 | 350W | Torque sensor |
The takeaway isn't that bigger watts or a torque sensor alone makes a bike good — it's that the two specs answer different questions. Watts (and peak watts) tell you how much total power is available, useful mainly for hill-climbing headroom and top-end assist. Sensor type tells you how that power gets delivered moment to moment. A bike that's strong on paper but cadence-only can still feel clumsy under you; a modest-watt torque-sensor bike can feel more composed than its spec sheet suggests.
What to ask before you buy
Sensor type doesn't always make it into a listing's headline bullet points the way wattage and battery size do, so it's worth asking directly rather than assuming. A few questions that cut through marketing copy:
- "Is this a torque sensor or a cadence sensor?" — ask in exactly those words. Some listings say "smart assist" or "responsive power delivery" without naming which sensor is behind it.
- "Bilateral or single-side torque sensor?" — a bilateral sensor reads both pedals independently, which can smooth out assist further than a single-side reading. Not every torque-sensor bike specifies this, so ask if it matters to you.
- "Can I test ride it, or is there a return window if the feel isn't right for me?" — ride feel is genuinely subjective, and a 14-day return window (like the one Mihogo USA offers) gives you a real-world check that a spec sheet can't.
Sensor type is one piece of a bigger picture. If you're comparing e-bikes from scratch, our complete buyer's checklist walks through the other six things worth checking — frame weight, battery capacity, brakes, warranty and more — before you commit to a purchase.
Frequently asked questions
Is a torque sensor always better than a cadence sensor?
For most riders, yes — a torque sensor delivers assist proportional to your pedaling effort, which feels more natural and is easier to modulate on climbs or in stop-and-go traffic. A cadence sensor is simpler and cheaper to build, which is why it's common on budget bikes, but the assist tends to feel like it switches on and off rather than scaling smoothly.
Can I tell which sensor type a bike uses just by riding it?
Often, yes. If the assist feels like it arrives a beat late and then holds steady regardless of how hard you're pedaling, that's typically a cadence sensor. If power rises and falls in proportion to your effort in real time, that's a torque sensor. But the sensor type is also usually stated in the bike's spec sheet if you ask directly — it's just not always in the headline bullet points.
Does a torque sensor use more battery than a cadence sensor?
Not inherently — battery use depends mainly on how much total assist you draw over a ride, not which sensor delivers it. A torque sensor can actually help you ride more efficiently, since assist matches your effort instead of over-delivering at a fixed level regardless of how hard you're already pedaling.
What sensor does the Mihogo Air Max use?
An 85 Nm bilateral torque sensor, paired with a 750W motor (900W peak). It reads pedaling effort from both sides and scales assist accordingly, rather than switching on at a flat rate.
Frequently asked questions
Is a torque sensor always better than a cadence sensor?
For most riders, yes — a torque sensor delivers assist proportional to your pedaling effort, which feels more natural and is easier to modulate on climbs or in stop-and-go traffic. A cadence sensor is simpler and cheaper to build, which is why it's common on budget bikes, but the assist tends to feel like it switches on and off rather than scaling smoothly.
Can I tell which sensor type a bike uses just by riding it?
Often, yes. If the assist feels like it arrives a beat late and then holds steady regardless of how hard you're pedaling, that's typically a cadence sensor. If power rises and falls in proportion to your effort in real time, that's a torque sensor. But the sensor type is also usually stated in the bike's spec sheet if you ask directly — it's just not always in the headline bullet points.
Does a torque sensor use more battery than a cadence sensor?
Not inherently — battery use depends mainly on how much total assist you draw over a ride, not which sensor delivers it. A torque sensor can actually help you ride more efficiently, since assist matches your effort instead of over-delivering at a fixed level regardless of how hard you're already pedaling.
What sensor does the Mihogo Air Max use?
An 85 Nm bilateral torque sensor, paired with a 750W motor (900W peak). It reads pedaling effort from both sides and scales assist accordingly, rather than switching on at a flat rate.