Heart Rate Data in 3 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 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.
Extensive Running Dynamics
When running, this pairing allows your compatible wearable to report 6 running dynamics metrics: cadence, stride length, ground contact time, ground contact time balance, vertical oscillation and vertical ratio.
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
Additional
- 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
fēnix® 3 HR
fēnix® 3 Sapphire
D2™ Bravo
D2™ Charlie
D2™ Delta
D2™ Delta PX
D2™ Delta S
Descent™ Mk1
epix™
fēnix® 3
fēnix® 5
fēnix® 5 Plus
fēnix® 5S
fēnix® 5S Plus
fēnix® 5X
fēnix® 5X Plus
fēnix® Chronos
Forerunner® 630
Forerunner® 735XT
Forerunner® 920XT
Forerunner® 935
quatix® 3
quatix® 5
quatix® 5 Sapphire
tactix® Bravo
tactix® Charlie
VIRB® 360
Example of Typical Uses
HRM-Tri |
HRM-Swim |
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 |