So here we go... This is the accuracy thread for the V3.
Now for my first post here, I need to inform you, that my comparison is with a Kettler Ergoracer S (2016 model). Note this bike has a flywheel which resistance is being controlled electronic. The bike is calibrated according to a DIN std. and the bikes comes along with the calibration sheet. My bike is slightly below actual wattage. As a simpel test, I do get the same result when doing a FTP test either on Kettler or outside with a different powermeter. So the wattage must be about right.
Back when I had Vector 2, one funny thing, I had to set the pedalarm to 187 mm (actual is 170 mm) to get the same wattage as Kettler(!). Never the less is worked quite well. With that setting I got good comparable data from both sources. So when getting V3 in my hands, I started out setting the pedalarm length to 187 mm. Once done riding, I compared the data. To my surprise and happiness, I found that V3 had to be adjusted to 171 mm to perfectly aligned with Kettler. Sweet thing - so I adjusted to 170 mm. However on the following ride, V3 was clearly not showing enough(?!). Going through the same comparison, I calculated the adjusted pedalarm to now 198 mm...!?!
So my very first conclusion here, based on only two rides indoor on my Kettler with V3 is the following. To get aligned wattage, I see pedalarm length varies from 170 to 198 mm. That's a difference about 16%
Check out the charts below and let me hear your thought...
EDIT: can't upload my second picture. I'm gonna try again later...
ciq.forums.garmin.com/.../1280575.png
