Today i did a FTP test on Zwift with my Shift….
It was 50 Watts below my Outdoor FTP.
I am completly empty after the indoor test…
Result 219 instead of 270 some weeks ago.
It‘s crazy how bad the shift is or how off the watts are wrong…
My Companipn App shows orher Watts than on my MacBook during the ride.
It‘s crazy & i don‘t have words for it
I got a Kickr Shift about a month ago. Was very excited, to be ‘upgrading’ from my SB20.
It’s not been great. Wahoo dropped the ball on this product. Thinking of returning. IDK where else to go.
Does anyone have a within spec Kickr Shift?
Dual recording Favero Duos v Kickr Shift; shift is 4-6% less, sometimes up to 10%.
Some of what’s been eating away at me is Zwift claims this product is good enough for ‘Elite’ events.
I’m guessing this dual record would get me disqualified from any ‘Elite’ event.
The Kickr Shift feels like a toy compared to a training tool, or possible racing bike.
Funnily enough I’ve managed to borrow some power pedals to compare with mine as I was curious. I’ll dual record over the weekend and let you know what I find.
I dual recorded two rides yesterday with Garmin Rally XC200 power pedals.
I actually did three, but the pedals were so massively overreading for the first ride I had to discard i.e. spinning at 90-100rpm they were reading 4-500W whereas my shift was 50-100W! I tightened the pedals as much as I could, recalibrated and they were better.
First ride link ZwiftPower - Analysis - Neil Blackburn - Stage 4 | Tour de Zwift
Second ride link ZwiftPower - Analysis - Neil Blackburn - Zwift - Group Ride: Standard | Stage 4 | Tour de Zwift on Lutscher in Innsbruck
So I’m seeing the opposite to you. I don’t have the tools to correctly torque the pedals and I’ve read if they aren’t then readings are affected.
Your pedals reading slightly more than the shift seem correct to me, as they are reading the power at source. I assume the shift will record power at the end of the belt, so some power will be lost before it does.
Funny. 
Usually it takes a few days/big sprints of the pedals ‘settling’.
Also make such your crank length is correct in pedal power app.
But it would appear your pedals and shift would probably align after a week.
All I can say is that’s wild.
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I agree some power loss, but on a belt system as shift it should be very very little.
Crank length was correct and before each ride I did around a 15 minute warm up with a few hard sprints, then recalibrated. Before the second ride the recalibration didn’t adjust anything.
I suspect I could get the readings a bit closer to the shift if I could torque them correctly, but I only had them for a day so it wasn’t worth buying an adapter for my torque wrench.