Garmin HRM-Tri

Running Heart Rate Sensors & Straps

For triathletes who want all the data, the HRM-Tri provides heart rate information from beginning to end. The HRM-Tri captures heart rate data during swims and forwards to the Forerunner 920XT or other compatible devices after the session. In addition to standard heart rate metrics for every leg of the race, it provides running dynamics.


Running Dynamics

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

  1. Cadence — the number of steps per minute. It displays the total steps (right and left combined).
  2. Vertical oscillation — the bounce in your running motion. It displays the vertical motion of your torso (measured in centimeters).
  3. Ground contact time — the amount of time in each step that your foot spends on the ground while running (measured in milliseconds).

Running dynamics features are available only on the Forerunner 735XT, 620/920XT and Fēnix 2/3. HRM-Tri is compatible with several other fitness products but will only display heart rate when paired.

HRM-Tri is designed for running, biking and open water swimming.

• Bike rides, runs and bricks

• Open water swimming

• Multisport activities (for example: run to the lake, swim, and run home)

• Race day for a typical triathlon with open water swim

For pool swimming, HRM-Swim is recommended. It has a unique non-slip design that keeps it in place during push-offs and withstands repeated exposure to pool chemicals.


  • Designed for running, cycling and open water swimming
  • Very comfortable design (small and light)
  • Designed with rounded edges and no exposed seams
  • A simple bi-fold adjustment reduces elastic weight and makes sizing easy
  • Stores up to 20 hours of heart rate data during swims
  • Real-time heart rate to the watch when the monitor is out of the water
  • Running Dynamics
  • Battery life up to 10 months (assuming one hour/day use) with user-replaceable CR2032 battery


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Delivery Information

UK Delivery is FREE on orders over £10.

International Delivery within 3 working days via DHL (prices vary according to country).

Priority First Class Delivery within 3 working days (charge £5).

Next Day Delivery available weekdays on orders placed before 3pm for next working day delivery (charge £7).

Orders placed Monday - Friday before 3pm will be dispatched the same day.

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