[wrafl]

I was shocked to find my max heart rate at 240 after a 32 mile ride. I never even reached my max at 165.
Does it mean it's time to replace my year old HRM due to this malfunction or just forget the HRM in every ride?

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[twobikes]

Is your HRM digital or analog? Analog HRM's have been known to give high readings due to stray electrical signals.

[wrafl]

Is your HRM digital or analog? Analog HRM's have been known to give high readings due to stray electrical signals.

It's the digital model by Timex. It's over a year old so it's probable that batteries weakened since. Perhaps I need to upgrade to the Polar or Garmin.

[aliensporebomb]

Not only are they susceptible to interference but I've found that sometimes they just spazz out all by themselves - once after a workout I found it had been tracking a "heart rate" all by itself when it wasn't
even connected to my body and the readings were off the human scale.

In this digital world with wireless everything I've found everything from computer wireless to
electronic dog fences will interfere with the darn things.

[wrafl]

Replacing the battery on the chest strap corrected the anomaly. There's no need for me to shop for a new HRM.
I found the owners manual that explained everything regarding incorrect reading.