4iiii has officially launched an updated version of its Viiiiva Heart Rate Monitor, and you’ll never have to worry about it dying mid-ride.
Boasting an impressive 540+ hour battery life from a single standard CR2032 coin cell, the new Viiiiva is designed to be a “set it and forget it” piece of gear.
Beyond the massive battery, 4iiii is leaning heavily into the Viiiiva’s role as the missing half of the performance equation for riders already using their PRECISION power meters. While your power meter tells you exactly how much wattage you are pushing into the pedals, the heart rate monitor tells you the physiological cost of that effort.
As former WorldTour pro and 4iiii ambassador Alex Dowsett puts it, the two metrics aren’t competing; they are complementary. “Power shows what you’re producing, heart rate reveals how your body is responding,” Dowsett noted. “You can’t optimize what you can’t accurately measure.”
Phil White, President of 4iiii, told us, “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.”
The updated Viiiiva keeps things highly compatible, featuring both ANT+ and Bluetooth connectivity to instantly talk to any head unit, indoor trainer app, or smartwatch. It also carries an IPX7 waterproof rating, meaning it will survive torrential rain or the heaviest, most humid indoor trainer sweat sessions without shorting out.
At a lightweight 46 grams, it promises not to be a distraction when you are deep in the red.
The Essential Specs:
- Battery: 540+ hours (CR2032 coin cell)
- Weight: Under 46g (including battery)
- Connectivity: ANT+ and Bluetooth
- Durability: IPX7 water resistance
- Range: Measures 30 to 240 BPM
- Fit: Adjustable strap for 26 to 52-inch chests