Scale it up over 1. Mine is set to 1.02 to account for a 48/52 % difference in my L/R power, and Im using one sided power pedals vs my Quarq pm which is dual sided.
Does it matter (Iām asking the question for my own education)?
If you use PowerMatch I think TR is getting pedal-generated power, your bike outside will be pedal-generated power and your FTP is pedal-generated power. Iāve always understood there to be small differences between power meters.
I always assumed that the pedals would read higher. In my case my pedals read almost perfectly with my KICKR Core and about 6% off from my TACX Neo. Iāve not tinkered with any scaling.
At least in my case Iām trying to triangulate some modicum of consistency between my XC100, Vector 3 and Kickr. In particular I noticed a large drop in FTP test results once I switched the XC100s which could be a calibration issue or could be that I really did lose that much fitness 
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Makes total senseā¦Iāll post my DC Analyzer File links if they help. I was doing the exact same thing and my FTP also dropped (when taken on my Neo). Now that my KICKR and XC200s are close Iām feeling like they are just fine. Good luck getting it sorted. Iām interested in what you turn up.
Cheers
Tim
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Just got a set of Garmin Rally XC200. Not ridden outside with them yet, but have done a quick Zwift to compare power data with Kickr v4. The XCs are reading about 4% higher than the Kickr, whereas my Assioma Duos read about 3% lower than the Kickr. Dunno what to believe anymore 
. Any suggestions on how to deal with this? Would you just scale the XCs down and the Assiomas up to match the Kickr so that at least I can use power-based training indoors, road riding and off-road?
Good question. I use my XC200s with two trainers. With PowerMatch, TrainerRoad always matches whatever my XC200s are reporting. Iāve used the DC Analyzer tool to compare. So, at this point, I have not scaled anything. Iām thinking the minor difference (in my case) is not significant and I am using the RallyXC200s as baseline since I use them on both bikes and trainers. I am sure someone smarter than me will chime in.
Here is an example of my ride today. Zwift was recording the Neo broadcasting data via Ant+. TrainerRoad was recording via BLE from my Rallyās and my Garmin Edge was recording the Rallyās via Ant+.
Thanks for the feedback @TimmyR
@gpl thanks for the suggestion. Iāve ordered a calibrated weight. Assuming this turns up before the weekend Iāll do a static weight test with the Assioma Duos and the Garmin XC200s and report back.
If anyone knows where I can find the manual for how to perform the static weight test with the Garmin Rally XC200 Iād be interested in hearing.
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whoever suggested torqueing them up to spec, thanks a lot! My pedals were consistencly reading 10w lower than my kickr core. Now that I have torqued them up, they read identical 99% of the time, and about 1-3w different 1% of the time. So pretty much perfect! 
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Following is the interaction I had with Garmin Support relating to performing a static weight test with the Garmin Rally XC200.
TLDR - you can only perform the static hanging weight test if you have a compatible Garmin Edge head unit. If youāre using a Karoo 2 like me youāre SOL.
[12:37:02] bdb : I canāt locate the manual for how to perform a static hanging weight test for the Garmin Rally XC200
[12:37:03] Session started between bdb and Samuel. Please give me a moment to look into your issue and I will be right with you.
[12:37:46] Samuel :
Hello, thanks for contacting Garmin. Youāre speaking to Samuel.
[12:38:06] Samuel : Have you looked at this - https://www8.garmin.com/manuals/webhelp/GUID-F384D11E-79B0-4D97-BB69-DD8922C20299/EN-US/Rally_series_OM_EN-US.pdf
[12:39:09] bdb : I donāt think thereās any information in that manual for performing a static hanging weight test
[12:39:18] bdb : Have I missed it?
[12:39:23] Samuel : Thank you for this information, please give me a moment to look into this
[12:43:04] Samuel : Rally RS/RK/XC Owners Manual - Performing a Static Torque Test
[12:44:22] Samuel : You can also view it on page 12 of the manual
[12:44:24] Samuel : This is an automated message, I havenāt heard from you in a while. Would you like to continue chatting?
[12:45:00] bdb : There is no link to ātorque testā Rallyā¢ XC200 | Garmin Support
[12:46:31] bdb : In the manual, it only describes doing a āstatic zero calibrationā. There is no information on how to perform a static hanging weight test.
[12:46:53] Samuel : One moment please
[12:48:52] Samuel : Is this what you are referring to - Vector Power Meter Advanced Torque Test /
āVector owners can perform a static torque test on each pedal to see if it is operating within spec. The range should be +/- 2% of expected torque by hanging a known load on each pedal.ā
[12:49:15] Samuel : If not can you explain in more detail please?
[12:50:57] bdb : Yes. That is the test Iām referring to. It looks like I have to have a Garmin Edge device to perform the test. Is that correct?
[12:52:41] Samuel : Yes that is correct
[12:52:50] Samuel : The static torque test is intended for advanced cyclists and installation experts. This test is not required under normal circumstances to achieve good results with the Rallyā¢ system. This test is available for compatible EdgeĀ® devices.
[12:54:50] bdb : I donāt have a Garmin Edge head unit. Iām using a Karoo 2. Can the test be performed using an app instead?
[12:55:03] Samuel : I am afraid not sorry for this
[12:55:33] bdb : So thereās no way to perform the static torque test without a Garmin Edge?
[12:55:41] Samuel : That is correct
[12:55:49] bdb : Oh no.
[12:56:14] Samuel : Apologies for this, is there anything else I can help you with today
[12:56:34] bdb : This isnāt made clear in the literature. Can I return the pedals for a refund?
[12:56:48] Samuel : Where did you purchase them from and when?
[12:57:08] bdb : I purchased them from Sigma about 1 week ago.
[12:57:22] Samuel : Okay well you would need to talk to them
[12:58:15] Samuel : Is there anything else I can help you with today?
[12:59:10] bdb : I donāt think so. Can you suggest to Garmin that they make the static weight test available through the app so that there arenāt more disappointed customers like me?
[12:59:28] Samuel : Many of the comments/suggestions we receive (such as yours) are often evaluated towards potential implementation into future Garmin products or current unit software releases. We cannot guarantee that what you have suggested will be implemented, however we do appreciate you passing along your opinions. Please share your ideas with us at the following page on our website: Share Ideas | Garmin
[12:59:39] Samuel : Thanks for contacting Garmin today, you will shortly receive a copy of the chat transcript via email. If you need any further help please visit our Support Centre. I hope you have a good day!
[12:59:47] Samuel : The conversation has ended. If you still need help please get back in touch!
I recently did the static torque test with my Garman rally xc 200s. It ended up being less a 1% difference
. I only did it because I wanted to see you what would happen and also if that was the reason why They read 10 watts under my stages power meter. That is when I figured out to crank down the pedals like you donāt want to take them off, reset all angles every time you get on a different bike using the pedals, turning off the automatic zero, and calibrating before every ride (are usually calibrate after about 10 minutes of writing to make sure they get up to The temperature of the environment. They still read 10 water under stages but I canāt compare it to different companies. Therefore Iām leaving it how it is and not messing with the scale factor because at this time it seems unnecessary.
Pardon my hacked writing speak to text doesnāt work too well and Iām at work 
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I 've noticed the same thing between my garmin xc200 pedals and my kickr. The pedals are about 10 - 15 watts lower. Seems consistent though, so for my purposes - i.e. pacing long climbs on my MB - I have no issues with it.
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How are people feeling about Garmin reliability these days? Are the issues pretty well documented and taken care of now that weāre several generations in?
I was thinking about getting a pedal based power meter within the next half a year or so, and was looking at Speedplay Powrlink, Favero Assioma, and Garmin RS200.
The Speedplays arenāt even out yet, and will be the most expensive of the bunch for me. I currently ride standard Speedplays. The Assioma are obviously a crowd favorite, and would be quite a bit cheaper. Garmin has the Shimano offering (not a fan of Faveroās solution), and I have access to a discount with them that brings the price down to $719, roughly in line with the Assioma.
Is there anything I should be aware of that might push me in one direction or another?
Using a torque wrench to tighten to specs solved my problem!
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Guess I need to invest in a proper torque wrench (finally)
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And get the 15mm claw foot too.
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I canāt really comment on Garmin reliability as the XC200 are the first pair of power meter pedals Iāve had from Garmin. I bought the XC200 because I wanted a power meter pedal specifically for SPD cleats. I have a set of Assioma Duo which have been very reliable, but I really donāt like the cleats. Iāve been using Speedplay for years so Iām keeping an eye out for Wahoo releasing the Powrlink Zero. If youāre anything like me then going from a dual-sided system such as Speedplay to a single-sided cleat will feel like a step in the wrong direction.
I posted above about breaking 3 pairs of rallyās in short succession.
So far, I think Iām happy with the XC200s. They seem consistent across two bikes. Iām already pretty vested in the Garmin tech-verse, so my Edge 1030 is working well along with my Fenix5. Iāve always had very solid support from them. I donāt love their UI for the Edge but so far I cannot complain much beyond that.
Short answer is there are still too many anecdotal stories of various issues with Garmin pedals and far too many fixes. I have tried them all on Vector 3S pedals and, at best, most fixes donāt resolve issues in the long term. Issues appear to be coming up with Rally pedals as well. I am fully committed to other Garmin products but will stick to other PM options from here out.
Ok, so to follow-up on doing a comparison between my Wahoo Kickr, Favero Assioma Duo and Garmin Rally XC200 I did a static weight test on the Assioma Duo (which came in as on spec). Then calibrated the Kickr using the standard spin-down and calibrated the Rally XC200 using the in-app zero offset.
I rode an identical workout in Zwift using identical equipment except for switching the pedals. The first data set compares the Kickr with the Assioma Duo.
The data align closely, with the Assioma Duos reading ~1.5-2% lower than the Kickr. Given that the static weight test was within spec for the Assioma Duos, it seems likely that the Kickr is reading a little high as the Kickr should read ~3-4% lower than the Duos owing to drivetrain losses. In any case, they are close enough to one another to be useful from the standpoint of being able to use either the Kickr or the Assioma Duos and compare between workouts, although I tend to just use the Assioma Duos as the power source when Iām Zwifting.
Comparing the Kickr with the Rally XC200s looked as follows:
The XC200 read ~9-10% higher than the Kickr (~11-12% higher than the Assioma Duos). Unfortunately, I canāt perform a static weight test with the XC200 as I donāt have a Garmin Edge head unit (Iām using a Karoo 2 - see my interaction with Garmin Support above).
Seems to me that the XC200 are way out of spec. Be interested to hear thoughts on this.
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