Andy Devaney
The Viiiiva Heart Rate Monitor has arrived as the latest addition to 4iiii’s performance line-up, bringing with it a blend of precision, comfort and the sort of battery life that should outlast most people’s enthusiasm for changing tiny coin cells. Built for athletes of all abilities, the new monitor is designed to deliver accurate heart rate data across training, racing and recovery, whether the session unfolds on the road, indoors or somewhere wet and unpleasant in between.
At the centre of the Viiiiva Heart Rate Monitor is a high-sensitivity chest strap that captures the heart’s electrical activity with medical-grade precision. In simple terms, it is built to give athletes a cleaner and more dependable reading of how the body is responding under load.
That matters because heart rate remains one of the most useful performance metrics in sport. It helps athletes understand effort, manage training intensity, measure recovery and track progress over time. In an age where everyone wants data, the trick is finding data that actually says something useful.
Built for long sessions and hard miles
4iiii has leaned into durability and practicality with this launch. The Viiiiva comes with an IPX7 waterproof rating, a lightweight design and a claimed 540+ hour battery life from a single CR2032 coin cell. That combination makes it well-suited to athletes who train frequently and do not want to spend half their lives charging, pairing or replacing devices.
Weighing in at under 46 grams including the battery, it is also designed to sit comfortably through long sessions rather than becoming one more bit of kit that starts as a good idea and ends as an annoyance.
Compatibility is another important part of the pitch. With both ANT+ and Bluetooth connectivity, the Viiiiva Heart Rate Monitor can transmit data instantly to head units and indoor training apps, making it suitable for a broad range of training environments.
Why heart rate still matters
For all the attention placed on advanced performance metrics, heart rate remains one of the clearest ways to understand what is happening inside the body during exercise. While speed, pace or power can show output, heart rate shows the physiological response to that effort.
That is where the Viiiiva Heart Rate Monitor fits neatly into the wider 4iiii ecosystem, particularly alongside the PRECISION 3+ Powermeter. Used together, the two devices offer a fuller picture of training and racing performance by measuring both external workload and internal response.
The combination can help athletes track fitness gains more accurately, optimise recovery, train at the correct intensity and refine training zones with greater confidence.
Phil White, President of 4iiii said: “Heart rate and power are extremely valuable metrics for any athlete, irrespective of their level, aims or ambitions. The Viiiiva completes that equation for athletes using our power meters, providing both the internal and external view of performance. It offers the same level of accuracy and durability that defines our power meters, so you can trust your data in any conditions, from racing in the rain to long sessions on the indoor trainer.”
Designed for every level of athlete
One of the more sensible parts of this launch is that 4iiii is not pretending this is a niche tool for elite racers only. The Viiiiva Heart Rate Monitor has been positioned for athletes across the board, from committed beginners to experienced competitors.
Its adjustable chest strap fits chest sizes from 66-132cm, while heart rate measurement spans from 30 to 240 BPM. That gives it the flexibility to support everything from recovery work and endurance training to higher-intensity efforts and race preparation.
Alex Dowsett, Former WorldTour Cyclist, Coach and 4iiii Ambassador said: “I tell every athlete I work with that power and heart rate aren’t competing metrics, they’re complementary. Power shows what you’re producing, heart rate reveals how your body is responding.
The Viiiiva and PRECISION 3+ pairing gives you both with total reliability – which is essential whether you’re chasing marginal gains or building sustainable fitness. You can’t optimise what you can’t accurately measure.”
Dowsett’s point is a fair one. Training has become more sophisticated, but the principle remains simple enough: better information tends to lead to better decisions.
Key features of the Viiiiva Heart Rate Monitor
The new device includes:
- 540+ hour battery life from a single CR2032 coin cell
- Comfortable, lightweight design at under 46g including battery
- ANT+ and Bluetooth compatibility for indoor and outdoor training
- IPX7 water resistance for demanding conditions
- Precision heart rate measurement from 30 to 240 BPM
- Adjustable chest strap for chest sizes from 66-132cm (26-52″)
A smart addition to the 4iiii line-up
The Viiiiva Heart Rate Monitor is a logical addition to 4iiii’s growing performance technology range. Rather than chasing novelty, it focuses on the basics athletes actually need: dependable data, strong connectivity, comfort and durability.
For athletes already training with power, it strengthens the overall performance picture. For those focused on heart rate alone, it offers a streamlined option designed to work across a variety of environments and devices.
The Viiiiva Heart Rate Monitor is available now through 4iiii retail partners worldwide and at www.4iiii.com
