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Best Cycling Power Meters (2026): Pedals, Cranks and Spiders
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The classic mistake is buying the cheapest power meter without checking whether it fits your bike: many only work with specific cranks. First, decide on the type (pedal, crank or spider) and whether measuring one leg is enough for you. We picked eight models that cover every type and budget. Prices from Decathlon and Amazon (Spanish stores) on September 29, 2026.
How we compared
- Compatibility with your cranks, cleats or groupset.
- Single-sided or dual-sided: price versus data for each leg.
- Rated accuracy: ±1% on the best, ±2% on the most basic.
- Battery: rechargeable or coin/AA cell, and how many hours it lasts.
- How easy it is to move between bikes.
Quick comparison
| Power meter | Price | Type | Measures |
|---|---|---|---|
| SRAM Rival AXS E1 (left crank) | €161.35 | Spindle/crank | Single-sided |
| InPeak PowerCrank-E | €329.00 | Crank | Single-sided |
| Magene P515 (spider + cranks) | €299.00 | Spider | Total (both legs) |
| Sigeyi AXO (Rotor Aldhu spider) | €299.99 | Spider | Total (both legs) |
| Favero Assioma UNO | €378.50 | Pedal | Single-sided |
| Magene P715 | €449.00 | Pedal | Dual-sided |
| Favero Assioma DUO | €509.50 | Pedal | Dual-sided |
| Garmin Rally RK110 | €654.57 | Pedal | Single-sided (upgradable) |
Single-sided or dual-sided
Single-sided meters measure only your left leg and double it. They're cheaper and fine for training by watts, but if one leg is stronger, the total reading drifts.
Dual-sided meters measure each leg separately. They give your true power and left-right balance, which is useful if you're coming back from an injury or want to fine-tune your technique.
Pedal power meters
It sits inside the pedal spindle. It's the easiest to install and move between bikes: all you need is a pedal wrench.
The trade-off is that you're locked into the pedal's cleat system, usually Look Keo or Shimano SPD-SL.
Crank power meters
It's bonded to the left crank arm. It's light and cheap, but it has to match your groupset (Shimano 105, Ultegra or SRAM Rival) and crank length.
Spider power meters
It sits in the spider that connects the chainrings to the right crank. It measures the force of both legs together, so it gives you true total power.
It only fits specific cranks and installation is more involved.
1. SRAM Rival AXS E1 (left crank)
€161.35
For anyone who already has SRAM Rival AXS cranks and wants power data for very little.
TypeSpindle/crank, single-sided
Accuracy±1.5%
BatteryAAA battery, up to 400 h
Pros
- The cheapest on the list.
- AAA battery lasting up to 400 hours: no charging needed.
- Installs by swapping the left crank.
Cons
- Only measures the left leg and doubles the reading.
- Only works with SRAM Rival E1 cranks with a DUB spindle.
2. InPeak PowerCrank-E
€329.00
For cyclists with a Shimano 105 or Ultegra groupset who want a simple power meter.
TypeLeft crank
Accuracy±2%
BatteryRechargeable, up to 90 h
Versions105 R7100 (€329) and Ultegra R8100 (€409)
Pros
- Comes mounted on a genuine Shimano left crank.
- Rechargeable battery lasting up to 90 hours.
- Bluetooth and ANT+.
Cons
- Only measures the left leg.
- ±2% accuracy, slightly lower than pedals.
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3. Magene P515 (spider + cranks)
€299.00
For anyone planning to switch cranks who wants to measure total power for little money.
Type110 BCD spider
Accuracy±1%
BatteryUp to 380 h
Spider weight99 g
Pros
- Measures the power of both legs together.
- Battery lasting up to 380 hours.
- 4.8 across 26 reviews.
Cons
- Only works with Magene cranks (PES or TEO).
- Left-right balance is estimated.
4. Sigeyi AXO (Rotor Aldhu spider)
€299.99
For anyone who already has Rotor Aldhu or Vegast cranks and wants total power.
Type110 BCD 4-bolt spider
Accuracy±1%
BatteryRechargeable, up to 300 h
Weight80 g
Pros
- Measures the power of both legs.
- ±1% accuracy and a battery lasting up to 300 hours.
- Just 80 g.
Cons
- Only compatible with Rotor Aldhu or Vegast cranks.
- Installation is more involved than pedals.
5. Favero Assioma UNO
€378.50
For anyone who wants power meter pedals and to move them from bike to bike.
TypePedal, single-sided
Accuracy±1%
BatteryRechargeable, 50+ h
CleatsLook Keo
Pros
- Swaps between bikes in minutes with a pedal wrench.
- ±1% accuracy even with oval chainrings.
- Can be upgraded to DUO later.
Cons
- Only measures the left leg.
- Look Keo cleats: if you use Shimano, you'll have to switch.
6. Magene P715
€449.00
For anyone who wants to measure both legs with pedals without paying Assioma DUO prices.
TypePedal, dual-sided
Accuracy±1%
BatteryRechargeable, up to 120 h
CleatsLook Keo (K) or SPD-SL (S)
Pros
- Measures each leg separately.
- Battery lasting up to 120 hours.
- Versions for Look Keo and Shimano SPD-SL cleats.
Cons
- Few reviews: 4.6 (12).
- A bit heavier than the Assioma (314-318 g per pair).
7. Favero Assioma DUO
€509.50
The benchmark for measuring both legs and moving your power meter between bikes.
TypePedal, dual-sided
Accuracy±1%
BatteryRechargeable, 50+ h
CleatsLook Keo
Pros
- Data for each leg and true balance.
- ±1% accuracy even with oval chainrings.
- Bluetooth and ANT+, compatible with almost any bike computer.
Cons
- 50-hour battery: you have to charge it often.
- It's more expensive on Amazon (€631.11).
8. Garmin Rally RK110
€654.57
For Garmin users who want single-sided pedals with the option to upgrade.
TypePedal, single-sided
Accuracy±1%
BatteryRechargeable, up to 90 h
CleatsLook Keo
Pros
- Rechargeable battery lasting up to 90 hours.
- Can be upgraded to dual-sided (Rally 210) with the right-side spindle.
- Full integration with Garmin Edge computers and watches.
Cons
- Measures only one side and is the most expensive on the list.
- Only one review on Amazon.
Verdict
If you have SRAM Rival AXS cranks, the €161 Rival E1 is unbeatable. With Shimano 105 or Ultegra, the InPeak PowerCrank-E is the simplest way to get started. If you want to move your power meter from one bike to another, go with pedals: the Favero Assioma UNO to start, and the Assioma DUO or Magene P715 if you want to measure each leg. The Magene P515 and Sigeyi AXO spiders give you total power for about €300, but only if your cranks are compatible.
Frequently asked questions
Is a single-sided power meter worth it?
Yes, it's enough for training by power zones. If one leg is clearly stronger, the total drifts by a few points.
Which power meter is easiest to move between bikes?
Pedal-based ones: they come off with a pedal wrench in a few minutes.
Does every power meter fit every bike?
No. Crank and spider meters depend on your cranks, and pedal meters depend on the cleat type.
Do power meters work with Zwift and bike computers?
Every model on the list transmits via Bluetooth and ANT+, so they work with Zwift and with most bike computers and watches.
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