HRM-Tri | Garmin


Enhance your triathlon experience by pairing HRM-Tri with any compatible Garmin wearable. The HRM-Tri stores heart rate data when underwater, then forwards it to your wearable at the end of your swim. Our smallest and lightest heart rate monitoring module fits within the width of the strap. The strap's soft, rounded edges and covered seams make the strap it super-comfortable out of the water, too.

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

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Example of Typical Uses



Bike rides, runs, bricks Pool swims
Open water swims Open water swims
Triathlon competition (open water swim) Triathlon competition (pool swim), triathlon kit not required
Triathlon competition (with pool swim) while wearing triathlon kit Runs or bike rides as part of a multi-sport activity that includes a pool swim

Physical Specifications

Unit dimensions (LxWxD): 23.5”-56.0” x 1.2” x 0.5” (60.0 – 142.0 x 3.0 x 1.2 cm)
Weight: 2.1 oz (59 g)
Module size: 29.4 x 51.4 x 8.5 mm
Module weight: 1.7 oz (49 g)
Size adjustment: Bi-fold
Sizing range: 23.5”-56.0” (60.0 – 142.0 cm)
Battery: CR2032
Battery life: 10 months (Tri training 1 hour per day)
Water rating: 5 ATM


ANT+® heart rate: yes
Supports heart rate variability and advanced heart rate features: yes
2.4 GHz ANT wireless communication protocol: yes
Running dynamics: yes
Stores and forwards heart rate: yes
Swim interval heart rate statistics: yes
Non-slip design for pool swimming: no
Pool chemical resistant: no