They had me do a pyramid power test using the wahoo app and share the results. They are sending a replacement after reviewing them. Hopefully the next one works.
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Have you tried connecting the Core to the Wahoo App and comparing the power numbers during a ride?
My core 2 seems off when standing too. Seems like I should be putting out 400-500 watts and it’s only giving me like 300. Did you get a new unit and is it better now?
I’ve had my Zwift Ride and Kickr Core 2 for a couple of weeks and have had the same issue with resistance on the Core 2. It’s waaaaaaaay too hard. Did a hilly race on Sunday, thought I was just having a bad day but now I’m convinced it’s seriously under-reading. When I was descending I could barely turn the pedals on the harder gears even when doing 70kph.
FWIW I’m an experienced rider/racer, been on Zwift since the start, been using a power meter for a decade, coming from a standard geared bike and an original Kickr.
I think it’s an issue with the auto-spindown not working properly. When I first got it a couple of weeks back there was no way to do a spindown in the Wahoo app. Then I ran a firmware update over the weekend and they now give you the option to do a spindown, which I’ve done, but not had chance to test it yet. Going to dual record with my Favero pedals and check it. Will report back.
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Have you tried changing the wheel size setting in the Wahoo app? Even if it looks right, change it down a very small amount.
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Pretty sure wheel size is irrelevant on a direct-dive trainer without wheels?
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it is, but there was a bug that helped resolve things if you changed the size of the wheel.
Ah ok - thanks, will give it a try.
Very common firmware bug on the Core V1 but I’ve never heard of it affecting a V2. Would be quite interested to know if it helps. On the Core V1 the wheel size would somehow get set to a null value which broke virtual shifting.
On the Wahoo trainers I’m pretty sure it uses the wheel size when it sets the base resistance for 0% incline.
I did the new spindown yesterday and just finished a 45-minute race with dual recording. The Kickr Core 2 still reads about 5% lower compared to the Assioma Duo. The Analysis is public on ZwiftPower.
As you likely know, there’s always going to be a bit of a discrepancy between parameter pedals and smart trainer with a smart trainer, usually reading a bit lower. That said, I’m curious, did you do a factory spin down or a regular spin down?
I did the Spindown which is now available in the Wahoo App for the Core 2. What is the difference?
That seems within reasonable limits. The Core 2 is accurate to within 2%, and the Assiomas to 1%. So with a couple of percent or so drivetrain losses as well that sounds ok to me.
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See the section titled New spindown (CORE 2) to learn more about that feature
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In addition to Paul’s link. Here is an article from ZI explaining the difference between types of spindowns.
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Quick update - I compared the power reading from the Kickr Core 2 to the power reading on my Favero Assioma pedals. Sure enough, the Kickr is under-reading by around 60w. No wonder I was struggling in the hilly Zwift race on Sunday!
Tested Zwift with power coming from the Favero Assiomas and the Kickr Core 2 controlling resistance and it’s still comedically hard. 20 RPM in the hardest gear when going down a 7% hill!
I think it must be faulty. Sent a support ticket to Zwift to find out what to do next.
No idea if it would help but have you tried this:
I will have to try the spin down and changing wheel size. I have a quarq and saris h3 and the power from those were very similar. I want to put the quarq on the core 2 and see what it says.
Is there an update about your situation? I‘m having the exact same issues on a brand new kickr core 2.
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