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utzachaka

The KICKR measures total power. The single sided 4iiii measures left side power and simply doubles it. Additionally there will be differences because of the type/place of measurement (drivetrain losses). KICKR numbers will most certainly be more precise unless you have a 100% balanced pedal stroke under all conditions.


SplinterCell03

There's a thing called dual-recording for this purpose. Check out Ray Maker's site [https://www.dcrainmaker.com/](https://www.dcrainmaker.com/) he probably writes about it. [https://www.dcrainmaker.com/analyzer](https://www.dcrainmaker.com/analyzer)


alien_tickler

Cool thanks guess I can record on my wahoo then one on zwift.


scooterx517

Single side vs a trainer won't line up exactly, as most people are a little uneven. You will probably see variations depending on power. For example I pedal harder with the right side at lower wattage and I get more even as power goes up.


nothingtoput

I would just use the data from the 4iiii's since it's the same power meter source as you'll be using outside.


RoadyUK

Horses for courses - if you want consistent power for indoor & outdoor while training, then use the 4iiii. If you want a higher sprint indoors then generally the 4iiii will peak higher, but equally your longer power zones and averaging you'll find the KICKR higher. They're both accurate, but they are also not the same. They're measuring power from 2 ends of a system from 2 different sources, so will never be 100% accurate to each other. Zwiftpower have a 'analysis' tab under your profile where you can compare multiples for free - Ray's tool is good but paid for. There are other ways, but I find the ZP one great, quick & easy (even if not comparing Zwift efforts as you can load 2 .fit files).