Polar Street X - Best Deal From Europe? (Scientific Review)
In a Nutshell
Polar Grit X delivers solid heart rate tracking (0.98 correlation for spinning, 0.95 for running) but struggles with cycling (0.79) and weightlifting (0.70). Sleep stage tracking scores average (59% sensitivity), while GPS performs adequately for most use cases but isn't exceptional. At around 250 euros, it offers good value with solid build quality and European data storage, though it lacks standout performance in any category.
These notes were generated by AI and may contain inaccuracies.
Polar Grit X might be the best compromise for you when it comes to sports and health tracking. The focus is on using objective data tested on the reviewer to figure out how good this watch actually is. The introductory video on the Polar Grit X and all its functionalities is linked below.
The easiest exercise tested is spinning. Results show the reference ECG chest strap along the horizontal axis and the values according to the Polar Grit X along the vertical axis. Most points are on or close to the blue line, which is very good for Polar. There are a few moments of deviation where it's detecting too low heart rate. Overall correlation is 0.98, which is really close to the maximum possible correlation of 1.
Individual sessions show that for most intervals, heart rate was detected correctly. There was a tiny bit of struggle in the beginning of sessions, potentially because skin was still warming up. Once properly warm, no trouble was experienced. This suggests potential struggles in the dead of winter.
The Polar Grit X is positioned among some of the better devices in the overview. The correlation of 0.98 places it really among some of the better devices. When zooming in on devices with correlation of 0.95 or higher, the Polar Grit X is not that far away from other quite okay performing devices like the Amazfit Helios strap. It's not quite up there with the actual best performing devices, which are Apple Watches and Huawei devices.
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