kosmo886

I use my kickr with a different bike than my bike with a left crank stages power meter, and I am unsure of the numbers coming back relative to what I am used to outdoors. I want to ride my bike with a PM on the kickr and compare power numbers so that I can get a feel for the differential between the two. Ie. Want to know which is reading higher or lower and by how much.

What is the best way to do this? I typically do workouts in Trainer Road on ERG mode on the trainer. Is there a way to just free ride and capture power data from the kickr and power meter (through my Garmin Edge I assume?).

unterhausen

A garmin can receive and record multiple data sources, but it looks like it requires a IQ app to do that. Otherwise it makes you chose.
DC rainmaker has a tool to do this if the data is in different files, but it costs money.

tempocyclist

You could link your KICKR to TrainerRoad and do a workout in ERG, while also recording power data from your Stages on your Garmin Edge.

Sticking with ERG you should be able to get a consistent power number for each interval session, then compare that to the data file recorded by your Garmin. From that you can work out ant percentage difference between the two.

Of course you could just free ride in Zwift or whatever, but the ERG workout will give you easier-to-analyse data afterwards.

himespau 

If you're just curious and don't want to quantify it and have Zwift, you can go to the pairing screen and then click on "unselect" for your power meter and then click to choose a new one. When you are in the screen to choose a new power meter, it will show you all the potential choices and how much power they are all reading at the moment. If you have them all set to the same type of reading (instantaneous power or 3s average or whatever), you can see what output they all have at whatever power you're putting out. You can try a little Z2, some Z4/5 and some out and out sprints and watch the screen. When I did that, I saw that my hub-based powermeter was ~5-10 W lower than my pedal-based meter (once sticky W were accounted for) at all the different outputs I tested, so I attributed that to drive train losses and decided that they were close enough that I didn't care.

msu2001la

If you have your Stages PM synched up with your Garmin, just record the ride on your Garmin, and also simultaneously record the ride on TrainerRoad. Then compare the results of both. You can also just compare the numbers in real time on both screens. The stages app will also show your power output on-screen from the meter, if you just want to live compare.

I've done this with my Kickr Core and Stages PM in the past. The numbers between the two are pretty close.

Barry2 

I did that test..
My coach decided that my indoor Kickr Bike and Stages outdoor were reading differently.

compared the following….
Road bike, Stages Dual vs Garmin Vector 3
wahoo Kickr Bike vs Garmin Vector 3

The vector 3 dual read 3% higher than both Stages and Kickr bike.
I used two Wahoo bike computers to record the rides.

Barry

Sy Reene

I'm not familiar with Trainerroad, but I believe (tell me if I'm wrong though), that I can just use my stages if I want for power (and cadence for that matter) in Zwift and not use my trainer's power meter at all (which is an Elite Direto). Then, there'd be no equivalency mapping or whatnot you'd ever need to do. Can't trainerroad and your smart trainer use whatever power meter you want?

unterhausen

Yes, trainerroad can use a different power source.