Garmin HRM-Tri Heart Rate Monitor
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- COMPACT AND COMFORTABLE - HRM-Tri is the smallest and lightest heart rate monitor from Garmin. Designed with rounded edges and no exposed seams, the strap remains comfortable during extended hours of training.
- SWIM HEART RATE1 - Stores up to 20 hours of heart rate data during swims, then forwards it to a compatible device at the end of the session. It also sends real-time heart rate to the watch when the monitor is out of the water
- RUNNING DYNAMICS2 - Provides feedback on running form by measuring cadence, vertical oscillation and ground contact time when paired with a compatible device
- BATTERY LIFE - Lasts for 10 months (assuming 1 hour/day use) with user-replaceable CR2032 battery.
- Includes - HRM-Tri, manuals. Supports heart rate variability and advanced heart rate features
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From the manufacturer
HRM-Tri - Specifically designed for triathletes
Small and lightweight Heart Rate Monitor (HRM)
Garmin HRM-Tri is a small and light heart rate monitor from Garmin. Designed with soft rounded edges and no exposed seams, the strap remains comfortable during extended hours of training. It is designed to be worn when running, cycling and open water swimming. A simple bi-fold adjustment reduces elastic weight and makes sizing easy.
10 Months battery life
The battery lasts up to 10 months (assuming one hour per day use) with user-replaceable CR2032 battery. Enhance your triathlon experience by pairing HRM-Tri with Garmin Forerunner 920XT multisport watch.
- Lightweight and comfortable
- Designed for running, cycling and open water swimming.
- Stores up to 20 hours of heart rate data.
- Transfers data to your Garmin compatible device.
- Provides feedback on running form.
- CR2032 replaceable battery
HRM-Tri provides heart rate data in all three disciplines
Stores and forwards Heart Rate Data
For triathletes who want all the data, the Garmin HRM-Tri provides heart rate information from beginning to end. The HRM-Tri stores up to 20 hours of heart rate data during swims and forwards to the Garmin Forerunner 920XT GPS multisport watch or other compatible Garmin sports watch (Garmin fenix 3 or Garmin epix) after the session. It also sends real-time heart rate to the watch when the monitor is out of the water.
In addition to standard heart rate metrics for every leg of the race, Garmin HRM-Tri provides feedback on running form and running dynamics. The HRM-Tri has an accelormeter in the module that measures torso movement when running. When paired with a compatible Garmin product such as Garmin Forerunner 920XT, Forerunner 610, fēnix 3, epix or Tactix Bravo, it measures; 1. Cadence – the number of steps per minute, 2. Vertical oscillation - the bounce in your running motion (the vertical motion of your torso measured in centimetres) and 3. Ground contact time - the amount of time in each step that your foot spends on the ground while running (measured in milliseconds).
See detailed data at Garmin Connect
See a complete picture of your activities with Garmin Connect, Garmin’s free online community where you can save, plan and share. Create workouts, training plans and goals to get the most out of your device. View detailed swim metrics, including heart rate graphs, swim pace, stroke type, mapping, and more. Instantly upload through the Garmin Connect Mobile app to share before you finish cooling down.
Enhance your triathlon experience by pairing HRM-Tri with Forerunner 920XT. Stores heart rate data when underwater, then forwards it to the 920XT. Garmin's smallest and lightest module fits within the width of the strap. Soft, rounded edges and covered seams make the strap super-comfortable out of the water, too. Forerunning, provides feedback on running form (cadence, vertical oscillation and ground contact time). Capable of storing up to 20 hours of heart rate data.
Legal DisclaimerAll returns subject to a 10% restocking fee; shipping costs are not refunded. Ships to US only; no APO/FPOs and no PO boxes. 10 day return policy.
Top customer reviews
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So when this HRM came out I was excited because one of its capabilities (primarily for swimming, where water will block the ANT+ signal) is to record HR data when a watch/etc is out of range and then later dump it all to the watch. I am happy to report it works as advertised with my Garmin Fenix3 watch. One important thing to note is that you MUST START THE ACTIVITY ON YOUR WATCH WITH THE HRM CONNECTED (IN RANGE). When you get done, you stop the activity on your watch and it will give you the option to look for and download stored data. Sometimes I have to try a second time but I've never lost a stored workout. This HRM accurately records the R-R data that FirstBeat requires.
I've found this HRM-Tri to be more comfortable than the Garmin HRM-Run I was using before. The elastic strap part feels more robust and that, plus the silicon-like rings on the contact patches, mean this stays in place more than the HRM-Run. It's less annoying overall on long, sweaty workouts than the HRM-Run.
One downside to the HRM-Tri over the HRM-Run is that the electronic sensor part does not pop off like it does on the HRM-Run. As a result, you have to hand wash the Tri once every seven uses while the Run you can toss the strap in the wash on gentle.
I do not swim so I can't comment on that use.
Overall I'm extremely pleased with this item.
2016/01/14 edit -- I've noticed in FirstBeat Athlete that for the same runs, the HRM-Tri tends to have a noticeably higher error % than the HRM-Run. For example, on a 30-min treadmill run the Tri error rate is typically around 12-18% while the Run is 2-6%. There is no immediate obvious downside to this outcome so for now I am not docking a star on the Tri.
2016/03/25 edit -- I'm bumping down to 4 stars for two reasons. First, as mentioned in my edit above, the Tri gets a higher error rate during "connected" activities where the watch is in range the whole time. I've come to realize that FB Athlete seems to not count error periods or count them as less. The net effect is that given the same stats (same time, distance, avg HR on a treadmill) runs with the Tri seem to be rated slightly less intense which I believe is due to its higher error rate. So for normal running, I tend to stick with the HRM-Run. Second, the HRM-Tri gives very high error rates in FB Athlete (40-55%) when I use it in disconnected mode during competitive sports.
2017/11/29 edit -- About 1.5 years ago, I upgraded from the Fenix 3 to the Fenix 5s watch (the 5s is superior in every way). The Tri worked just the same with the 5s. Since the 5s has the built-in optical wrist HRM, it can be hard to make sure the Tri has connected and is being used instead of the less accurate (and without HRV/R-R data) optical sensor. Unfortunately, almost exactly two years after I purchased the Tri, it has to be replaced. It's chewing through the CR2032 battery every couple days with perhaps 6-10 hours of use. I tried a fresh new set of spare batteries to make sure my original spares hadn't gone bad. I followed the instructions for care and it's definitely been showing signs of wear and tear. Overall I'm still happy and will be replacing it with another one.
Getting a heart rate monitor that actually has onboard storage is important, because the other monitors depend on the connection to either your smart phone or your fitness device, and are useless without those being right next to you. No... you can't run around the football field with your iPhone in one hand. And no, your basketball teammates and opponents won't like you very much when you cut there face open with your "smart watch"... and for Jiu Jitsu, forget it... you and the smart watch won't survive.
For BJJ specifically I was concerned that it wouldn't hold up under the pressure, twisting and impact, as well as it would potentially hurt my rolling partner or fall down and just get in the way and be useless. Happy to report that none of those are the case. I wear it under a rash guard, and don't think I'd try it without.
The bump on it has a softer blue rubber ring that doesn't dig or present any sharp edges to you or your rolling partner.
The clasp has been plenty strong enough, I do wear it pretty tight.
It hasn't slipped down significantly at all. The backside of the strap wonders down a little... but not enough to be a problem. It would be nice if they stitched a little nonslip fabric on the back side of the strap... but it still works.
I did have one roll where the blue rubber ring came off, which is apparently how you change the batteries yearly... but it was easy enough to toss to the side and then put back on after the roll. And that was 1 time out of probably 50 rolls that I've been through with it now.
I've never had any problems with it not capturing my data or having irregular heart rate results. All the graphs after syncing look spot on and there are no unusual dips or spikes that would indicate erroneous data.
If you're wanting to add some science to your contact sports training, or you're wanting to loose weight and would like an accurate calorie count based on effort not just time, you should seriously consider getting this heart rate monitor. It's amazing the difference between your perception of what two work outs that felt similar in effort were and the reality of how hard your body actually worked between those two workouts. Your mind lies to you about your body. The mind quits long before the body... get some data to know what's really going on!
It works as advertised! I've run with it a few times now, including an 11+ mile run. I hardly know it's there. No irritation at all. Of equal importance, my HR, cadence, vertical oscillation, and ground contact time are all consistent with the data I was getting from the HRM-Run. It's not only comfortable, but trustworthy.
I will never swim with it, but I look forward to many long, comfortable runs and bike rides. Thanks, Garmin!