Yes exactly. It’s all averages. Flat, average conditions, cyclist, bike, tyres etc.
Interestingly, I did a calibration on my Elite Direto the other week, as I was just messing around. Ever since getting it, it has read about 10w higher than my Power2max Type S on my TT. If I was doing erg workouts using my Edge, I would have to set the power target on the Edge 10w higher than I wanted to work at, as the Edge has no power match style feature, and so would (say) sent a command to the Direto to work at 250w, but that would only equate to a power output of c240w on my P2M.
Yet the last two days, it’s suddenly gone pretty much in line. If anything, the P2M is a bit higher. The only thing I can think is running that calibration on the My Elite Training app.
DCR analysis that he did for me when I originally got the Direto, and wanted to know which power stream a Garmin would record if connected to both a power meter and a smart trainer: https://analyze.dcrainmaker.com/#/public/506aba29-8a27-49b9-491f-1c115bef5a09
Comparison just now during a zwift race https://www.zwiftpower.com/analysis.php?set_id=26691
Well i pulled the pin and have cheakily ‘hidden’ in the purchase of a left sided 4iiii with my bike.
I know it’s not the most perfect solution, but it will be a good introduction to power and now you can get the rhs from 4iiii at a later date.
I don’t have a cycle head unit, so it’ll all just be on my forerunner 245, but that’s fine. Maybe i’ll upgrade next year to get a basic edge or something similar.
The only downside will be if i’m still Zwifting in 2 months when the bike arrives … as i’ll clearly be getting a nice, big, fat ego deflation! haha
Would it work on my scabby bike i have now? I’ve bought a 105 power meter, but my Allez has the lowest Shimano set on it (below even Sora). Or would i risk doing some damage to the new PM? That’s assuming i have the tools to actually fit the thing, and my current crank arm isn’t totally welded on … i don’t want to end up with no bike at all!
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It just depends on what bottom bracket you have.
If it’s a hollowtech you’ll be fine. Post a pic of your crank!
A 105 left crank arm should fit on any shimano hollowtech II chainset I think
thanks guys - i’ll go take a look. No idea what a hollowtech is … my Allez is like 9 years old or so. I’ll take a look later
You might be alright but make sure they are the same length as well 
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A hollowtech chainset will look something like this:
yeah good point!!! haha
EDIT* Nope … just dug out the geometry for my model - 170mm but the Canyon is 172.5mm.
Never mind. Probs for the best!
I’m sure you can get them in different sizes? Possibly another benefit of pedal power meters.
The one I’ve bought is pre mounted on a 105 crank arm. So I’ll have to swap out once the canyon arrives. Its OK, I can wait a few more weeks.
I see some online merchants are out of stock of Garmin Vector 3’s. I wonder if there has been a run on then with all the isolation training, or Vector 4’s are coming this year?
It’ll be fine to fit the 172.5mm powermeter in place of the existing 170mm crank if you want power on the old bike too. You won’t even notice any difference.
Cheers. To be honest I’m a bit scared of wrecking both the old bike and the new crank. I have a terrible history of ruining things whenever it involves even the most basic of mechanical tasks! 
Does anyone have any experience with the Avio Powersense?
I bought one earlier this year and had it installed at a dealer on an Ultegra Crank. As I was new to training with power I compared it against a Taxc Flux TT and found it seemed to run about 20w higher than it. When I did the FTP test, I recorded with the Flux on TR on the Ipad and with the Powersense on the my Edge 530.
In the end, the Edge gave me an 8% higher FTP so seeing as I was going out on the road, I just reduced my TR workouts by the 8% and carried on. I never struggled on the TR rides and found them challenging though not draining.
The only information I can find online with the Powersense is a quick mention by DC Rainmaker on one of his videos and a Reddit complaining of an early version.
I need a new PM as my bikes were stolen recently so was wondering whether to invest in another one of these or go for the 4iii instead as it’s well reviewed.
No. I was looking for reviews as they are £149 installed, but there is so little information about them, and what I could find seemed to question the power readings…
I don’t know anything about the specific PM but I don’t think 8% is all that bad.
If both the PM and turbo have a 2% accuracy there’s potentially 4% and then your PM is on the crank before all of the drivetrain losses your turbo is seeing.
Yes, I’m surprised for a power meter that there’s so little information out there, especially as it seems about 2 years old now and such good value.
I suppose that with it being the price it is, quite a few people will have bitten and bought and if they were horrendous, there’d be loads of reviews all over the internet saying so.
Still undecided between this and the 4iii for a year or so of working with a single sided power meter.
The 4iiii has really decent reviews. It seems to be as good as you can get for a low cost, crank based one sided. You also have the option of upgrading it to a dual side at a later date.
I bought one a few weeks ago, but still waiting for my bike so not used it yet. No previous experience of power to compare. But at 218 quid, it certainly appears to be excellent value for money and a perfect intro to power.
No personal experience, but there was some similar chat on my club fb group a couple of weeks ago, and a few people said they had one and had found them reasonable.
Unless you had a specific issue with them, I can’t see any harm in just continuing with a setup you are familiar with at that price. Unless you want to go for something with added features, like dual sided pedals you can shift between bikes, etc.