HRM 2?

Mi_chael

snow*

https://www.reddit.com/r/Suunto/comments/1w7an5x/suunto_smart_belt_2/#lightbox

The chest strap appears to have been improved with the addition of vertical inserts to prevent it from slipping

Tieutieu

@snow let’s see if it’s durable. Usually such things don’t last that much. Curious to see what improvements it will bring ; I use my chest straps all the time (except on very long ultra trail races)

snow*

from Suunto hk:

Designed for performance-driven endurance athletes, marathon runners, triathletes, and cyclists who demand absolute data accuracy. Constructed with a premium stainless steel and polymer composite housing, the SUUNTO Smart Heart Rate Belt 2 (SHRM2) captures clear ECG signals directly from the chest. Whether pushing through high-intensity intervals, racing on the road, or cycling over rough terrain, it delivers lag-free, rock-solid accuracy far superior to wrist-based optical sensors.

High-Resolution R-Peak Detection & ZoneSense Optimization
Featuring an upgraded 2nd-generation sensor array with higher resolution R-peak detection, the SHRM2 captures subtle beat-to-beat intervals (HRV). This precise data feeds directly into SUUNTO’s proprietary ZoneSense algorithm, offering real-time insights into your aerobic, threshold, and VO₂max stress zones during workouts.

Torso-Based Running Form Dynamics
Eliminate the need for additional foot pods or waist sensors! When paired with compatible Suunto performance watches (such as Suunto Race, Vertical, and Run series), the belt provides comprehensive running biomechanics:

Ground Contact Time (ms) 
Vertical Oscillation (cm)  
Flight Time (ms)  
Left/Right Balance (%)  
Cadence (rpm) & Step Count

Swimming Memory & Offline Storage
During swim workouts or periods of temporary signal loss, the sensor automatically records heart rate data to its onboard memory. Once back on land or reconnected, stored data seamlessly transfers to your Suunto watch, giving you a complete ZoneSense and heart rate graph from the water.

Multi-Device Connectivity & Zwift Integration
Equipped with Bluetooth 5.4, the SHRM2 supports up to 3 simultaneous Bluetooth Low Energy (BLE) connections. Broadcast your heart rate concurrently to your Suunto watch, bike computer, and virtual indoor training software like Zwift or gym equipment without signal drops.

Button-Controlled Security & LED Status Light
Stay in control with a new built-in LED status light that alerts you to battery levels and connection states. Secure, button-controlled pairing and encrypted transmission prevent cross-talk and signal interference in crowded start lines.

GratefulDeadpan

@snow SS and running mechanics

VoiGAS

@snow Sounds Like Generation 1 Watches will also be supported regarding running dynamics! Together with optimized Zonesense readings that would be an absolute dream for existing users

GratefulDeadpan

@VoiGAS that’s how I read it as well. Amazing stuff if that’s the case 🥳

snow*

@VoiGAS Judging by Joaquin’s review, it sure seems so…

VoiGAS

@snow Did I miss something? Could you provide the link?

snow*

@VoiGAS here

Inge Nallsson

@snow Thank you for the link. Enabling CC English text of the Spanish narration told me that the running ‘dynamics’ will be available after the run, in the app. I doubt the older generation watches will get a live view of that data (like Coros had even on a Pace 2 if connected to a Stryd) since Suunto claim the hardware is too limited to get a proper FW update nowadays, but the V2 and R2 series probably will.

Anyway, it seems like a genuine upgrade otherwise and absolutely required, to comply with EU rules regarding public protection of HR data streams.