Garmin HRM-Tri Wireless Strap and Sensor


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Heart Rate Data in all Three Disciplines...

  • Specifically designed for triathletes
  • Our smallest and lightest heart rate monitor (HRM)
  • Comfortable, easily adjustable strap
  • Stores and forwards heart rate data to Forerunner 920XT

Enhance your triathlon experience by pairing HRM-Tri with your Forerunner 920XT. The HRM-Tri stores heart rate data when underwater, then forwards it to the 920XT. Our smallest and lightest module fits within the width of the strap. Its soft, rounded edges and covered seams make the strap super-comfortable out of the water, too.



Running Dynamics

HRM-Tri also has an accelerometer in the module that measures torso movement to calculate 3 running metrics:

  • Cadence - the number of steps per minute. It displays the total steps (right and left combined).
  • Vertical oscillation - the bounce in your running motion. It displays the vertical motion of your torso (measured in centimetres). HRM-Tri is compatible with several other fitness products but will only display heart rate when paired.
  • Ground contact time - the amount of time in each step that your foot spends on the ground while running (measured in milliseconds).


Which HRM should I use?



  • Bike rides, runs, bricks
  • Open water swims
  • Triathlon competition (open water swim)
  • Triathlon competition (with pool swim) while wearing triathlon kit


  • Pool swims - non-slip design for turns, chemical resistant
  • Open water swims
  • Triathlon competition (pool swim), triathlon kit not required
  • Runs or bike rides as part of a multi-sport activity that includes a pool swim


  • D2 Pilot
  • Descent MK1
  • Fenix 3
  • Fenix 5 / 5S / 5X
  • fenix 5 Plus / 5S Plus / 5X Plus
  • Fenix Chronos
  • Forerunner 735xt
  • Forerunner 920XT
  • Forerunner 935
  • VIRB 360
  • Tactix Bravo


  • HRM-Tri
  • Manuals