Elite Qubo fluid & Misuro B+ vs Garmin vector. Accuracy test

Few months ago I started using Zwift with my Elite Qubo fluid wheel on trainer. I am interested in training on Zwift so I bought this little guy ( Misuro B+) in order to get some power data and possibly racing.

The Misuro B+ is designed for Elite hometrainers and it reads data based on the type of hometrainer used, in my case transmits speed, power and cadence data but I found out later that for racing on Zwift the sensor is not considered a power meter so I am classified as a ZP :frowning:

Anyway, I got a couple of Garmin vector from a friend of mine and did this test to check the difference in accuracy between the pedals and the sensor to make sure I’m training correctly based on my FTP.
As you can see the two tracks match quite well,

Looking at those zone benchmarks there are positive and negative fluctuations, so I’m pretty sure that Misuro doesn’t overestimate/underestimate constantly but randomly across all zones

Below distribution of differences

In numbers:

  • in 75% of cases the difference is between -4 and +5 watts
  • in 90% of cases it is between -11 and +12 watts

A serious difference is that there is about an 8 second time lag in the Misuro data, the pedals are clearly faster. Below the zoom at higher wattage

Interesting analysis. I wonder what the B+ says when the pedals register a really big sprint.

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I have an Elite Turbo Muin with the Misuro B+. It over-reads by about 15% against my 4iiii left side power meter and my Favero Assioma pedals, reducing to about 5% in a sprint.

Data here: ZwiftPower - Analysis - Noel Slevin - Zwift - Group Ride: ESCO Bohemian vs Sunrise Racing Team G2 on 2018 UCI Worlds Short Lap in Innsbruck

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I am going to test it tomorrow btw can’t afford more than 700w for few seconds I guess :slight_smile:

@Noel_Slevin smart trainers under estimates imho it’s not misuro over reading

Interesting, there’s another case study with turbo muin which leds to same result.

I wonder why it works better with my fluid trainer than turbo.

ZwiftPower analysis has set_id=345326
(I can’t insert link)

The problem with any type of fluid trainer is that when it heats up the fluid changes viscosity making the trainer easier to pedal, as the fluid gets warmer. Had an Elite Turno 4 years ago (basically a better version of the turbo Muin) that would read 5 % lower than my Quarq starting out, but slowly climb up to be around 10 % higher after 45 minutes.

I think the elite qubo being a wheel on trainer with very little casing might not be going that quickly up in temps as a closed case of direct drive trainer. You are also not producing that high of a power compared to the example you posted and have periods where you are doing 100 watts that allows it to cool off

Smart trainers are measuring, not estimating.

Smart trainers give bad measures compared to pedals that’s the point. Consistently lower.

mh… did not find much on the internet about the temperature thing, I’ve found people reporting more of sensations instead of true data.

I am not Cavendish :slight_smile: BTW I can safely say that:

  • data are realiable and fluctuations occurs in both pedals and sensor
  • in this 30 minutes workout discrepancy is really low and not overall significant (yes, I am a statistician)

Going to test two more trainer this week, turbo ones. Let’s see what’s going on. Stay tuned

I dont know that much about it but as i have understood it is a question of thermodynamics. As a liquid heats up the viscosity gets lower and therefore easier to break through the liquid as you pedal. The liquid heats up as we apply kinetic energy to it turning the pedals, and that energy can’t escape any other way than heat

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I’ll dig into this, just curious

BTW I followed your suggestion, did a “long” group ride this morning and tried to go up with watt here and there

this is the link to ZwiftPower analysis (if it works)

summary data seems really good to me
Schermata del 2023-05-09 09-53-22

Misuro B+ doesn’t measure power, it estimates, hence why Zwift don’t class it as a power meter, because it isn’t one. Proper smart trainers measure power and don’t estimate it.

Smart trainers will always measure sljghtly lower power than pedal/crank power meters due to drivetrain losses. But this is a pretty small difference.

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I am not arguing about Misuro B+ being a power meter :slight_smile: I am interested in accuracy for training rather than racing (on Zwift) and data shows that it does a good job in estimating power.
Can’t say nothing about 800W long sprint but that’s ok for me.

Smart trainers will always measure sljghtly lower power

I expect 1500€ smart trainers to be more accurate than 300€ ones, I think I will be able to do some tests in the next days

Good morning.

May I ask what is the end goal of this post? From your test it does look like you have calibrated your trainer to be comparable to the Garmin vector pedals.

In the long run it will be better to use the pedals as power source since they are more accurate and consistent.

As others have stated the trainer is sensitive to heat, tire pressure, roller tension and tire wear.

The goal is to provide data about Misuro reliability/accuracy for Elite Qubo fluid users not willing to pay hundreds of €€ for power meters, they still have a chance for good training.

My trainer is a wheel on so there’s no calibration involved, I do not own the pedals involved in the test :slight_smile:

Knowing how much heat can overestimate power could be interesting since on Zwift you can adjust the training bias accordingly. I would prefer data instead of statements :slight_smile:

Fluid trainers are the best bang for your buck when it comes to riding on Zwift. The cheapest one that i would recommend is the Kurt Kinetic fluid with a speed sensor.

These trainers are good to get into Zwift on a budget.

Me to, I prefer the data. You have the opportunity now to check all the sensitivities.

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I have Tacx Neo and P2M NGeco. Both MEASURING, difference never more than 2%.

Good for you (I would prefer data as always)

this is MEASURING Tacx flux S vs Garmin rally XC100
Schermata del 2023-05-09 18-44-52