I agree.
Luckily I’m using the same powermeter on the same bike as before.
Sure, but as I covered, the flywheel difference may still lead to different numbers.
Have you done a new FTP test with the new trainer?
Not yet.
FWIW the feeling is very noticeable to me when doing Z2 and/or recovery rides.
- Then I’d schedule a test soon.
Related to your use, are you using exactly the same gearing on the bike if you are running ERG, or even relative to what you may be using in any other mode?
- Matched gearing will still likely lead to different values, but different gearing on top of the different flywheels is a multiplier in changes.
In a positive or negative way? Or a neutral way?
Really just different, maybe slightly negative.
On the Kickr you get that “pedaling in mud” feeling when the flywheel is going slower (easiest gear at 200w) but can get away from it if you want by using a bigger gear (think 53x11 at 200w). This is in resistance mode or ERG for that matter.
On the H3 you can compensate the same way but you don’t get away from the mud feeling quite as much as I’d like.
This could all just be personal preference from what I’m used to from 6 years on a Kickr. I’m secretly hoping maybe this “working harder” feeling just ends up making me faster next year! 
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So just got a new H3 and have used it a couple times now. Noticed that the only modes available to me under device settings are ERG and STANDARD.
Shouldn’t there be a RESISTANCE setting as well?
Its been a while and I might be completely wrong, but change from which ever way your connected to the other, ie- connected using BT then switch to Ant+ and the other option should be available along with erg, thats if I remeber correctly.
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this.
And if you’re on a PC and cannot turn on Ant you’ll have to delete everything TR related and reinstall.
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Standard = resistance/slope in TR.
Somewhat confusingly on the Wahoo Kickr TrainerRoad supports (or supported) 3 modes but only 2 modes on other trainers.
If you have a Kickr resistance is not the same as standard/slope/level mode as shown in this TR support article: https://support.trainerroad.com/hc/en-us/articles/360016477712-Wahoo-KICKR-CORE
Kinda, but you are blurring two things that are different. Resistance is very different from Standard (aka Slope or Level modes per other resources).
Resistance Mode
This mode mimics the functionality of a magnetic trainer with a linear power curve. This mode includes a variable resistance setting that can be electronically adjusted.
Standard Mode
This mode mimics the functionality of a fluid trainer with a non-linear, exponential power curve. This mode includes a variable resistance setting that can be electronically adjusted.
I have installed a cheapy 12 speed HG cassette on my H3 so I could run my MTB on it. No issues.
I put a 12 speed Eagle NX cassette I had on my H3 for my MTB. Gearing is off (runs off the 12the gear but don’t want to mess with the adjustment or limit screws for when I put the wheel back on… maybe using the wrong spacer?) Anyway, I just find a middle gear that is smooth and use Erg mode. Works well as long as you don’t shift. 
Can you just use an 11 spd for the trainer and not worry about the final gear? I think that should work for you-if you don’t need to shift through all 12 gears on the trainer.
That’s not a practical solution consider that Saris claims that the H4 is directly compatible with Shimano’s 12 speed cassettes.
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I got 12 speed dura ace coming in and I have the H3 & Hunt wheels. This is not sounding good
Dang, designs and tolerances for the loss here. Thanks for the work and reporting on this. Just a bummer that stuff can’t simply “work” these days 
I sent my H3 back last week with bearings issues. Now I cannot get them on the phone or no response on email.
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In the designs and tolerances for the loss column, my park tool Shimano cassette lock ring adapter doesn’t fit over the QR adapter on the H3. So as I mounted my 10-speed cassette for my TT bike, I’ve only been able to tighten the lockring by hand. It’s not going anywhere, but a couple of the smaller cogs have a slight bit of wiggle and it impacts the shifting at that end of the cassette on the trainer. Pretty annoying, and I’m open to any solutions (even ones that will make me slap my forehead for being an idiot.)
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