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power2max NGeco SRAM Road Power Meter 
power2max NGeco Race Face MTB Power Meter 
Sigeyi AXO Cane Creek eeWings Road Power Meter 
Sigeyi AXO SRAM MTB Power Meter power2max and Sigeyi both make spider-based power meters for road and MTB bikes. These are some of our best-selling power meters. They bolt right on to your existing crankset (no need to buy a new crankset or change bottom brackets!), measure power from both legs and are accurate and reliable. In addition, with many of the road versions, you can even reuse your existing chainrings.
power2max makes 2 versions of their power meter: the NGeco and the upgraded NG, which features improved accuracy, a rechargeable battery, a longer warranty and left/right leg power balance. Sigeyi only makes one version of their power meter, the AXO. In the table below, we compare these popular power meters.
power2max vs. Sigeyi Power Meter Comparison Table
| power2max NGeco | power2max NG | Sigeyo AXO | |
| Cost | $490-590 | $940 | $380 |
| Power Measurement | Both legs | Both legs | Both legs |
| Power Balance | No | Yes | Yes |
| Communication Protocol | ANT+, BLE | ANT+, BLE | ANT+, BLE |
| Claimed Accuracy | +/- 2% | +/- 1% | +/- 1% |
| Active Temperature Compensation | Yes | Yes | Yes |
| Battery Type | CR2450 | Rechargeable | Rechargeable |
| Battery Life | 300-400 hours | 150 hours | 300 hours |
| Cadence Measurement | Accelerometer | Accelerometer | Accelerometer |
| Weight | ~125 – 160 grams | ~120 – 152 grams | 83 – 115 grams |
| Warranty | 2 years | 5 years | 2 years |
| Manufacturer Location | Germany | Germany | China |
Summary
As you can see in the table above, the power2max and Sigeyi are very similar power meters. They install and function in the same manner, however, they are not without some differences. Let’s break these down briefly…
Cost
By all means the power2max NGeco represents a great value for what you get. We are big fans of these power meters and use them on many of our bikes. For $490 – $590, you get a wonderfully reliable and accurate power meter. However, the Sigeyi at $380, is even more affordable still. So, if the Sigeyi ticks all the other boxes you need, you might want to give it a shot and save some money.
Weight
The power2max power meters weigh around 120 to 160 grams based on the version, whereas the Sigeyi comes in at 83 – 105 grams. This difference isn’t much in the grand scheme of things, but if weight is a priority for you, you might want to go with the Sigeyi.
Power Balance
The power2max NGeco measures power from both legs right out of the box. However, if you want to see your power balance, you must upgrade the power meter to access this information. The Sigeyi power meter however comes with power balance already installed and ready to go.
Models
While not in the table above, we wanted to touch on the different models power2max and Sigeyi makes. In short, power2max makes a slightly wider range of models than does Sigeyi. For example, they offer a track power meter, multiple gravel power meters as well as a power meter for Campagnolo, among other differences. However, we note that Sigeyi currently makes models for e13 road and MTB cranksets, whereas power2max does not.
| power2max | Sigeyi | |
| SRAM Road | Yes | Yes |
| Praxis Road | Yes | Yes |
| Cane Creek Road | No (but expected) | Yes |
| ROTOR ALDHU | Yes | Yes |
| ROTOR 3D | No | Yes |
| Specialized | Yes | Yes |
| Easton | Yes | Yes |
| Cannondale Road | Yes | No |
| Campagnolo | Yes | No |
| SRAM MTB | Yes | Yes |
| Race Face | Yes | Yes |
| Praxis MTB | Yes | Yes |
| Cannondale MTB | Yes | Yes |
| ROTOR MTB | Yes | Yes |
| Shimano MTB | Yes | Yes |
| e*thirteen MTB | Yes | No |
| Cane Creek MTB | No (but expected) | Yes |
| ROTOR ALDHU Track | Yes | No |
| ROTOR for Shimano GRX | Yes | No |
| ROTOR Gravel | Yes | No |
Which One Should I buy?
Either! power2max makes wonderful power meters. We use them on a number of our own bikes here. We highly recommend them. Sigeyi is a newer power meter we started carrying, however it’s quickly becoming one of our best-sellers. It has a number of great reviews and also benefits from being slightly more affordable than the power2max. Take your pick and enjoy accurate, reliable, dual-sided power!