Are you getting the spikes up to 240/250 bpm on all three of these heart rate monitors??
Usually, I’d recommend replacing the battery, “resetting” the device (put in the battery backwards for 15 seconds), or replacing the device.
My other question is whether you’re getting these spikes indoors or only on the road? I’ve had a loose-fitting jersey flapping in the wind affect a chest strap HRM and make my HR numbers go up into that range before.
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