Paired a Tacx Neo and Assioma Favero to Edge 830

It is normal, due to the Neo is a hub based powermeter, the Assioma is a pedal based, and between the 2 measuring points there are drivetrain losses, the 10% a little bit high (question is on what power?), the common drivetrain loss (depending on used gear and which chainrings) is 5-8watts , with worn parts a little more. So at 100w the 10% could be true with big ring, at 200w it should be only 3-5% .

is it Duo or Uno (because if Uno, your left leg inbalance also can add a few extra watts)?

So both power values are (should be) accurate, just measured on different location. You can't set offset in 830, just 3rd party apps are able to do this like Zwift (power->Assioma , controllable trainer -> Neo and the Zwift is continously checking the offset between the 2 devices and adjust it) or TrainerRoad where it called PowerMatch function .

I am on 36-13 gearing in erg mode and my pedals are Duo. Depending on the training, i see a difference of 9-10 watts average ( so not 10% but about 10w) between Neo and Assiomas. 200w avg, the Neo is always lower.

So it seems normal...

Thank you

the 36-13 is not a good gearing , there are almost the biggest losses, the best (and recommended by trainer manufacturers also) is the 36 - and 5th or 6th (so middle) cog , so 36-19 or 36-17 if You are using 11-28 sprocket, the difference will be smaller, just test it! ;) , usually i have 4w difference on 34-19, the only case where i need 34-15 is the low cad drill because at 50rpm the 34-19 or 17 is not enough for sufficient braking power in ERG, the disc speed must be higher than 13km/h for accurate power/operation by Neo

here is a chart about possible drivetrain losses (my experience is that the reality a little bit lower than these values with a few watts everywhere but the ratio is valid so a good demonstration which gears should avoid to save watts indoor or outdoor ;))

Luko79 said:

usually i have 4w difference on 34-19, the only case where i need 34-15 is the low cad drill because at 50rpm the 34-19 or 17 is not enough for sufficient braking power in ERG, the disc speed must be higher than 13km/h for accurate power/operation by Neo

interesting, i tried Powermatch with Trainerroad (Neo2 & Vector3), but had so many drop outs during training, now i ride mostly 34/14 or 50/14 but the difference is sometimes 10 Watt.

So i have to handle 2 different FTP in Trainerroad and on Edge 830 (8 Watt)

you think it could be really better with 34/19 and high cadence 85 - 100?

Did You update the Neo2 to the latest firmware via Tacx Utility app? Crank length setting is right in the Edge also ? (the Edge overwrite the preset length in Connect app, so need to set it in both, especially if it different than the default 172.5)

V3 needs zero offsetting before every ride (it has auto zero as i know but i dont believe it :) )   Dropout usually comes from wifi interference or bluetooth interference, or the receiver (head unit, ANT+ dongle, mobile phone) is too far , need to eliminate these with tests and attempts.

In ERG mode always use the small front ring (so 34) and ~middle at rear  (so the 19 perfect  with 11-28) and avoid the big ring, harder to keep the pedaling smooth on it, especially on lower power, and much noiser,. and 85-100rpm is perfect, if You need to do very low cad drills, use the 34/15 for that interval, and change back for the rest intervals

you think 34/18 is good too, haven't 34/19?

www.j-berkemeier.de/Ritzelrechner.html

anyway, thanks, all other things checked, firmware Neo2 and crank length, heard, that Trainer Road working on a update on Powermatch too, will go soon to beta

Luko79 wrote:"....the Edge overwrite the preset length in Connect app, so need to set it in both, ...."

Where is the crank length in the Connect app?  I don't find any sensor related information in the app.

if you have Vector 3 you can pair them with BLT to the Android App and you are able to configure crank length, but for security reason i removed the v3 there, cause otherwise they are connecting to my mobile phone when i ride and have y mobile phone with me

Where do you find "Device Settings"?  Perhaps I would need to have the pedals paired with the GC app to see that?  I don't do that.  I only pair the pedals with the my Edge units, or PC/tablet for Zwift, Trainerroad, etc...