Suunto SHRB2 Firmware 3.2.6.8 Update

Dimitrios Kanellopoulos

@Maryn there will awlays be artifacts with belts. And not all libs do the same parsing.

So you need to establish the baseline in a way

Speed Man

@Dimitrios-Kanellopoulos https://quantified-self.io/user/Wn5k7NdDxrWRF578c9IxeLgywVB2/event/9396ac60cdc1f02c7999c0c580e248acdd389ad3eccd4950ff68664e32a77154

matram

@Maryn said in Suunto SHRB2 Firmware 3.2.6.8 Update:

What amount of artifacts (%) is the limit for a good measurement?

When I asked AI - the response was 3-5% for a DFA-a1 or HRV computation.

Maybe the time has come for an official response from Suunto?

Dimitrios Kanellopoulos

@Speed-Man check under RR and HRV both on the summaries and just above the charts Screenshot 2026-10-30 at 10.56.48 Screenshot 2026-10-30 at 10.56.43

Maryn

@Dimitrios-Kanellopoulos Yes, there will always be artifacts. My question is more about what percentage can be considered a good measurement, acceptable, for example, in terms of Zone Sense.
I used to have a lot of artifacts, and that was the reason I had to replace just the strap on my Suunto sensor. Since then, I’ve been getting results in the 0-1% range.

Speed Man

@Dimitrios-Kanellopoulos Can I view the data in a graph? I’ve been trying to find that option, but I can’t seem to locate it.

Dimitrios Kanellopoulos

@Speed-Man jsut press the hrv-rr button bro see my pic. The show charts button

Speed Man

@Dimitrios-Kanellopoulos I got it working now. Thank you very much!

stromdiddily

today’s run - stead 90 minutes, rainy weather, ON synthetic top

snow*

@isazi said:

Forwarded this discussion to the product manager at Suunto

Just checking in: has there been any progress since this was forwarded to Suunto’s PM? Thanks!

VoiGAS

Today wet belt and (different) merino - and a lot of noise

isazi

@snow I am not testing the HRM2, I only shared a link to this post, but have no way to check the testing firmware and if anything improved

atoponce

@VoiGAS I gave up on it. Got tired of battling it. Unfortunately, I’m outside of the 30-day return policy, so I’m stuck with it. I’ll wait for a firmware update that hopefully addresses it. Maybe I’ll just sell it. Went back to my Polar Verity Sense which has never let me down. I don’t have ZoneSense, but at least I have reliable HR.

Egika

@atoponce Polar Verity Sense is just optical, isn’t it?
You won’t get R-R data from that one at all.

as far as I know, all electrical HR chest belts can suffer from ESD, and all deal with it in the same or a similar way. But I am no expert.

snow*

@Egika said:

as far as I know, all electrical HR chest belts can suffer from ESD

That’s true, @egika, but the noise of SHMR2 (speaking for myself) is definitely higher than, e.g. my Polar H10… I therefore wonder how accurate ZS might be as a result of this

Speed Man

My personal workaround was to apply electrical tape over the metal surface on top of the SHRM2 module. I’ve been using it this way, and the performance has been quite stable so far. The only minor inconsistencies occur during sudden pace increases or high-impact movements.! 1000057561.jpg

snow*

@Speed-Man said:

over the metal surface on top of the SHRM2 module

afaik module’s surface isn’t conductive. Where did you get that information?

Speed Man

@snow I think it might be metal because it looks and feels quite hard.

atoponce

@Egika Yup. Optical armband, so no R-R data and no ZoneSense.

The SHRM2 is significantly worse than my Polar H10. I purchased it because it promised artifact rejection at the module, but I’m seeing a lot more noise.

snow*

same merino tshirt (most recent activities were more or less the same)
I wonder if the skin-contact surfaces (polyurethane according to Suunto’s specs) could improve their contact with the skin over repeated use and washing (only rinse it with warm water and no detergent)