KICKR 2018 v Quarq on XX1

I have a 2018 KICKR and a Quarq PM on my mountain bike with an XX1 AXS drivetrain. Firmware is up to date, everything is installed correctly, the drivetrain is clean, and both devices are zeroed. Regardless of where on the cassette I run the chain, the PM reads 6% higher than the KICKR.


I can understand the 2% tolerance, but I’m concerned that these are off by 6%. Have you experienced this, do you have any suggestions? @Jonathan

Just use powermatch…

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I understand, but when flipping between different bikes on the trainer and in the real world, accuracy matters as much as precision.

That seems like drivetrain loss, measuring at the spider vs at the cassette/wheel. It’s normal and unavoidable.

Basically, you’re never going to get them to match, so don’t worry about it and mental adjust depending on your situation.

But I will help you with the math here to let you understand why your reading above could POSSIBLY all be correct.

  1. assume both quarq and kickr are 2% off
  2. assume there are 1-2% energy loss from the chainring thru the chain, cassette, freehub body, drive wheel on the trainer.

You can be putting out 104w on the quarq which would read 2% high at 106w
You then would be putting out 102w on the kickr with would read 2% low at 100w.

(Okay. I’m rounding on the math, but you get the point.)

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Hi, same here, my Kickr doesn’t match my Quarq. It is close is some parts of the power curve and not in others. But it is consistent. I just use Powermatch and don’t even think about it anymore.

Make sure you have power smoothing turned off on the Kickr.

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Same here with H1 and Quarq XX1. Tolerances, drive chain loses and more importantly IMO, different power devices.

So to ensure my power inside (TR & Zwift) matches power outside, I only use the Quarq power meter and use Powermatch.

This is the end of the issue for me as I have one bike and one trainer but can see why having a many bikes/trainers this would be an issue. Guess you might have to have a cross reference chart for different bikes, or get them all fitted with a Quarq (Expensive!!)

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I’ve done a lot of comparisons testing between my Quarq XX1 PM, my Kickr Snap and now my Kickr Core. You will never get the PM and Kickr to match. They may match at times depending on the workout, the power being put out and a bunch of other factors. The ONLY way to keep it consistent is to use PowerMatch. Below is my most recent comparison during a ramp test between my Quarq and Kickr Core. It started off close but then drifted away from each other later in the workout.

Let’s take another approach. Does anyone have a trainer that is accurate with a 148 bike?

If you’re referring to boost 148 that is what I’m using.

Let me clarify…

You said that your PM and KICKR never lined up. I want to know if someone has a trainer that is lining up with their PM on a boost bike.

Very unlikely any two power meters will be identical; lots of posts on that. Powermatch is your friend; or just accept your TR FTP (trainer) will be different to your outdoor FTP (power meter).

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