What are your experiences with the accurate power meter on the Kickr BIKE v2?
Has anyone done dual analysis with Assioma power meter?
I have Assioma PRO RS-2 power meter and I did some duals… The result surprised me…
I think such a deviation is not acceptable!
The differences are also 4% and more
Do you have similar problems? How did you solve them?
Kickr Bike - Wifi direct connection
Assioma - Ant+ to Garmin Edge
Which is higher? 
A consistent 4% accross the board or fluctuating?
If its 4% higher/lower all the way through, its not really a big deal as you can adjust to suit but certainly problematic if its occasionally +/- 4%
In principle, the average difference throughout the entire ride is 4%.
Wouldn’t you need to test with a third power meter to confirm if it is the bike or pedals that are correct?
I’ve got a Kickr Bike Shift and I compared it to some borrowed Garmin Rally pedals, I found the Shift recorded about 10% higher. But as I didn’t have another source to compare, I had no idea which was correct.
In the same boat:
Kickr Bike 2 - tested with ANT and with BT also
Assioma Duo - tested with ANT and with BT
Did several test runs back to back with 2 parallel Garmin head units recording (even changed them too back 2 back). For this the Zwift Power comparison tools could be a big help. Offcourse crank length was correct all the time.
Bike reports way higher power numbers, but this difference decrease as power goes up. My bike almost on pair with the Assiomas at or above 300-320W, and even reports lower than Assioma above 400W.
There is no solution for this, tried with the support but nothing worked, they were clueless in this case. They kept repeating that the Bike does not need calibration and it should be correct all the time. They asked for a ramp test (just few steps) made in the Wahoo app, but ignored my 2nd power meter source datas all the time.
For the winter i keep install the Assiomas to the Bike and use that as a power source. BTW i tried with the most recent Assioma generation too, and its the same. I have that which still has the pod on the axle.
SRAM Eagle powermeter was even worse, i had two on two different mtbs and they reported 7,5% and 8,5% more power by factory default. Luckily its easy to adjust them in the SRAM app. The newer SRAM T-type mtb powermeter was “just” 4,5% higher by default…But again, very simple to adjust powermeter slope to match Assioma 99.5-99.8%.
I have a KICKR Bike V1. I have been collecting and comparing data via DC’s tool and entering it in a spreadsheet. I have a lot of comparisons to my Garmin Rally XC 200 pedals which pretty consistently show that the KICKR Bike reports 4-6% higher power than the pedals. I recently purchased a set of Favero Assioma PRO MX-2 pedals and the data is shaping up to be the same. I am also building out data comparing them to a TACX Neo I use when I am away from home for work. I’ll post more when I have at least 10 or so data points for each.
You are also going to get different reading at the pedal vs the trainer on the back wheel.
Shouldn’t the power be higher at the pedals because it is the closest point to the input. Drivetrain losses should mean the kickr bike would yield a lower power value than the pedals not higher.
Yes, I must not have read closely. I have the KICKR5 and Favero pedals. I get about a 5% lower power at the KICKR. I use my pedals as the power meter source which corresponds nicely to the outdoors. Not exact but usable.
I started a support ticket with Wahoo this morning. My Shift is reading easily 10% lower than my 2 Quarq PM’s. The Kickr Core I came from was usually 2-3% lower than the Quarqs due to drivetrain loss.
I need to get my hands on a set of pedal based PM’s to verify but I was in Z3 HR riding easy Z2 watts.
I just use my pedal based power meter on my kickr bike V2 and powermatch. That way I get consistent readings inside and out. A minor pain in the ass compared to dealing with power meter discrepancies.
I got a reconditioned kickr bike 2 to replace my 4 year old v1 that died.
Had a harder interval ride last week that I totally crumbled on halfway through and needed to lower power a lot. Did a 2 endurance ride on Zwift Saturday that felt way hard for Zone 2 and my HR backed that up.
So yesterday put my assioma pedals on the bike and did a workout. I tried to dual record but something went wrong on my Garmin and ride didn’t save. But during ride I could see differences between the pedals and kickr bike with kickr bike clearly being much lower.
Outside bikes have a sram left crank power, single side assioma pedal, and power2max spider. going by feel all of those felt pretty in line with the kickr bike v1. But the replacement bike power is clearly way different. I’ll have to dual record for a few workouts to get a better sense.
Is there a reason you don’t run the assioma’s on the kickr bike v2 and use powermatch in TR? Just curious as that’s what I have been doing and have had no complaints. Definitely a difference between my garmin pedals and the kickr bike but could be where power is measured from. I’ve never given it much of a thought as long as I’m using powermatch and make the pedals my source of truth for both outdoors and indoor rides.
Mostly to avoid needing to needing move the pedals from kickr bike to road bike or gravel bike or mtb bike.
Up until this kickr bike v2 replacement my kick bike v1 the RPE and different watts felt correct. But with this kickr bike v2 the difference is significant. But it’ll be a 1st world probably needing to swap the pedals between bikes.
I know the bike isn’t supposed to need calibrating prior to each ride but maybe it needs a calibration. Not even sure if a calibration can be done by end user but might be worth reaching out to wahoo to see, I’d be interested to know as I own a V2 as well.
You could do a spin down calibration. That’s a good idea for any trainer that’s just been installed, moved or adjusted.
You can do a zero offset on power meters but that’s not the issue here. It’s not practical to routinely calibrate a power meter using weights to apply a known force. The best we can typically do is compare against another power meter, and that always begs the question as who is right. In many cases you can’t change the “slope” anyway.
The final option is to contact the manufacturer if the trainer seems significantly out of whack.
I’ll maybe do a few dual power recordings and see what they look like before I contact wahoo support.
Not a thing with the Kickr Bikes.
Fwiw I complained about the Shift reading 6% low, they sent me a new one after a month…same reading so I’m using the powermatch/Assiomas as well. It’s a great experience otherwise.
So I still need to do a dual record comparison between my assiomas and the kickr bike v2. Next week sometime.
But I did have a gravel race today and decided to dual record the assiomas and my sram crank arm PM which I hadn’t done before. Lots of punchy climbs. And the readings match super close. Not that I was expecting big differences but it’s nice that they’re so close.