4iiii Viiiiva HRM: Most of us wear a heart rate monitor, even if we don’t use the information to improve our fitness and training, but we do know if we have done too much, not enough, or maybe your coming down with a cold. 4iiii have released a new Heart Rate Monitor, the Viiiiva and PEZ has put it through its paces.
Comfortable and secure
Alastair Hamilton PEZ sez:
I’ve had quite a few heart rate monitors over the years. The first one I had would have been in the mid 80’s, I can’t remember who made it, but it had a chest strap and a cable that ran down your arm to a watch. Of course I had no idea what I was doing and probably rode my slowest evening TT because I was looking at the watch. Anyway since then I’ve had Cat Eye, Polar, Garmin and Wahoo, all worked well… until they didn’t. Now 4iiii, the power meter guys in Cochrane, Alberta have a HRM, introducing the Viiiiva.
Connecting to the 4iiii app
4iiii app workout and settings
The Viiiiva is very much just ‘click-and-play’. After you put in the CR2032 coin cell battery and slide the connectors into place either side of the unit, it just works. I downloaded the 4iiii app which you can use for workouts, but you will probably use your HRM with your bike computer, whichever that is. In my case I have two Wahoo computers, a ROAM and an ACE, also the Wahoo app on my phone. All very easy, just do a device search and 10 seconds later all is linked.
No problem connecting to Wahoo
Connecting to Zwift (or any of the other indoor cycling apps) is the same as every other time you go for an indoor ride. Log in, connect to HRM and that’s it.
Connect to Zwift
So connecting is easy, what about the HRM strap itself? The strap is made of a soft elastic material that is adjusted with a two buckle system. The rubber sensors are around 12cm long, they are a little thicker but still soft and flexible. The strap fastens at the front where two metal bars slide into the HRM unit with a noticeable click as it goes into place to be held securely. Easy to put on and take off with a comfortable feel.
Rear battery replacement
My only negative thought was ‘why isn’t it rechargeable?’ 4iiii’s reason is quite plausible: “4iiii opted for coin cell batteries to ensure the 540+ hour battery life remains consistent over the years without the degradation typically seen in internal lithium-ion batteries. It also ensures that athletes don’t have to worry about charging another device frequently; a quick battery swap once a year (or less, depending on usage) keeps it maintenance-free for long-distance training.”
I’ve been using the Viiiiva HRM for about a month and like all good monitors you forget you are wearing it. So far it has connected straight away and I’ve not had any drop outs or lost info. Obviously I’m nowhere near 540 hours of use, so I’ve not needed a new battery and there has been no problems. The price is similar to Wahoo and Garmin and I would guess the accuracy and dependability will be as good, or maybe even better… but time will tell.
4iiii Viiiiva Heart Rate Monitor – £64.99, €64,99, $99.99
4iiii sez:
Take Your Training to Heart
The 4iiii Viiiiva is a precision heart rate monitor designed to capture the most accurate picture of your internal physiological effort. Whether you’re pushing through a high-intensity workout, pacing a marathon, or climbing the virtual mountains of Zwift, the Viiiiva provides the real-time data needed to optimise performance, track cardiovascular fitness, and manage recovery with professional-grade accuracy.
Built for athletes of all abilities, the Viiiiva is engineered for comfort and extreme durability. With 540+ hours of battery life and an IPX7 waterproof rating, it is built to withstand the elements and your highest-intensity efforts. The Viiiiva is a reliable cornerstone of your training toolkit, providing the pulse of your performance every time you move.
Pair the Viiiiva with a 4iiii power meter to bridge the gap between external output (Watts) and internal response (bpm). This combination provides a total understanding of training efficiency, allowing you to optimise training zones and track fitness gains with total precision.
Ultimate Power Couple
The Viiiiva Heart Rate Monitor is the perfect partner for your 4iiii Power Meter, providing a complete picture of your training and racing. While power measures your external output (Watts), heart rate tracks your internal physiological response (bpm), giving you a total understanding of effort, fitness, and efficiency that power alone cannot show. Together, they allow you to optimise your training zones and track progress with total precision, making the 4iiii Viiiiva and PRECISION 3+ the ultimate power couple.
Designed with comfort in mind, the Viiiiva features an impressive 540+ hour battery life and an IPX7 waterproof rating, offering premium performance you can truly take to heart.
Features
540+ HOUR BATTERY LIFE
With over 540 hours of life from a single CR2032 coin cell, you won’t have to worry about frequent battery changes for your Viiiiva.
Water Resistance
Engineered for durability, our IPX7 water-resistance rating ensures your heart rate monitor keeps pace with you, handling your most gruelling training days without missing a beat.
ANT+ & Bluetooth
Get the same numbers training inside and outside. The Viiiiva is both ANT+ and BLE compatible so you can use it on your preferred head unit and favourite indoor training app.
Specifications
Chest Size: 66 – 132cm (26” – 52”)
Auto Power Down: 3 minutes
Transmission: ANT+ & Bluetooth®
Battery Type: CR2032 lithium ion coin cell
Battery Life: 540+ hrs
Operating Temperature: 0 – 50°C (32 – 122°F)
Storage Temperature: -20 – 70°C (4 – 158°F)
Data Transmission Range: 3m (9.5’)
Waterproof Rating: IPX7
Heart Rate Range: 30 – 240 bpm (1bpm resolution)
Input Sensitivity:5% duty cycle
Frequency: 32.768KHz
Weight: < 46g (1.6oz)
- More info at 4iiii.com.
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PezCycling News and the author ask that you contact the manufacturers before using any products you see here. Only the manufacturer can provide accurate and complete information on proper/safe use, handling, maintenance, and or installation of products as well as any conditional information or product limitations.
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