I recently did the Antelope workout which has 10-min intervals at around 90% FTP. Since I use a smart trainer in ERG mode, I normally do not shift gears and just leave it in my small chainring and a cog that makes the chain straight. Five minutes into the first interval, and holding a cadence of 85…

[image] aurigan: 30x36 felt utterly horrible, kinda like riding uphill on wet leaves. It was as if it was only letting me generate power at the top of the stroke before slipping then forcing me to overcompensate after the slip to get back up to power over and over and over and … Sounds like y…

[image] KickrLin: Are you running the latest firmware? Yup, was updated the day before … it’s just not mathematically possible for a smoothing algorithm to make 30s @ 50w over target completely vanish. The only way that happens is if you’re then under target afterwards for a significant time …

We really won’t know until you try a test with the “ERG Mode Power Smoothing” turned off. A retest in that condition may be more useful in seeing what is really happening here.

[image] aurigan: it’s just not mathematically possible for a smoothing algorithm to make 30s @ 50w over target completely vanish. It’s a known issue that in erg mode wahoo defaults to transmitting target power. Not actual. Dcrainmaker has pointed this out in reviews expressing his displeasure…

[image] DaveWh: It’s a known issue that in erg mode wahoo defaults to transmitting target power. So the ‘power smoothing’ option is in fact just a ‘lie to me’ toggle. Awesome. [image] DaveWh: Maybe it’s exaggerated on the kickr bike … Maybe, I think the way I had the (really big/littl…

[image] aurigan: In 56x10 (1st and 3rd intervals) the recorded power variability is high but the cadence variability was low. In 30x36 the exact opposite was true - power output looks a lot smoother but the recorded cadence is all over the place. [image] aurigan: Subjectively, 56x10 felt…

[image] CaptainThunderpants: I did a very similar experiment, switching back and forth between the big and little rings, and got very similar data Would be really interesting to see your power vs. cadence lines if you have the files still … and was this on a Kickr trainer?

Agree. The problem is the higher fly wheel speed on the trainers. Pick a gear that the output seems the same and stick to that in erg. Specially if you are training outside so the data is more consistent.

Yepp. Check the topic I’ve posted on this matter. Although the tacx is reporting the same power output, the 4iiii says differently. Could be that more people having this issue and that’s why the big vs small ring feels different in rpe/real power.

Big vs Small Chainring - Same Power (ERG Mode Gearing)

Training

SaSha1103 June 26, 2020, 6:40am 392

Check my post about this “issue” : Tacx Flux S - Gearing / accuracy

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Big vs Small Chainring - Same Power (ERG Mode Gearing)

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