I ran the numbers very quickly and see the disc a little bit faster.
But I also see the highest wattage lap as a bit of an anomaly so needs to figure out why.

What is your weight, what kinds of CRR do you assume, what kind of PM ?

Weight (rider+equipment) is 85 kg.
Crr I assumed 0.0032 but without really knowing what I should use. Tires are Gp5000 23mm front wheel (with latex inner tubes), same Gp5000+latex except 25mm rear for the 858, and Schwalbe Pro One TT tubeless 25mm for the disc wheel. All at 6.5 bar.

Power meter is two-sided Powertap P1 pedals, calibrated once just before the ride.

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https://besse.info/
https://www.strava.com/athletes/2012033

I see the average of 1,2,7,9 as .005 faster than average of 3&4 and 0.021 faster than average of 5&6

I assumed the barometric pressure you gave was local. Even if that at sea level, deltas should be similar.

Thanks, that goes in the same direction as my analysis (helmet difference about 3-4x the wheel one).


I also don't know, tried to simply push harder without changing my position. Maybe I should have done a second run, but as I said it was more to see the savings of the rider behind me (and those were very obvious).

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https://besse.info/
https://www.strava.com/athletes/2012033

 

It was only one run, so the data can not be trusted but it would show the guy drafting slowed you down.

But it could be a factor of things. I think you need to go out, do it again for science :-)

Thanks for sharing.

Based on my rough, elementary calculations, the disc saved you on ave 2s per run compared to the 858 at the same power, or roughly 20s/40km at your speed of >42kph.
This equates to around 3-4w saving, which is in the ballpark of what Jean-Paul Ballard (SwissSide's testing) has claimed a disc will save you compared to a "good" 80mm rear wheel, being 2w at 45km/h. (I tend to think this is more accurate than Aero-Coach's claimed 7w difference for their disc).

So your data seems pretty good and reliable...

By the way, what are your thoughts on the Aeron-X - handling, stiffness, build quality, etc? Do you think the hex skin is a benefit or looks gimmicky? I've been looking at this wheel and other Ron discs for a while, and your data is the first I've actually seen. The fact that your data shows its faster than an 858 and in line with what one would expect for any good disc wheels has me even more interested...

It's my first time riding a disc wheel, so I cannot compare with more established brands, but the feeling is really good (and it's likely to be my wheel of choice for most triathlons next year).

The wheel shows more inertia than the Zipp (maybe less fast/snappy accelerating, but also carries more speed when coasting right before a turn), and I feel it slightly when the roads goes up (not by much, but noticeable). I can only suppose any disc would be similar.

Handling is excellent, no complaints here. Had one ride with side winds where it took a little while to get used to (but seemed to be sailing quite well). It's been very predictable in general. On calm day and straight lines I couldn't really notice which wheel I'm riding.

Rigidity is good as well, tried a few 500-600 W sections out of the saddle and no brake rub.

Stickers or little finish points (came with two tiny scratches on this hexagonal pattern, pump adapter is to schrader instead of a more useful presta, etc) could be slightly cleaner but at the price I won't complain.

The hex pattern profile is very low, not sure it's helping much. I don't have any data to say whether this feeling is correct or not though.

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https://besse.info/
https://www.strava.com/athletes/2012033

Thanks. your comments about the handling and inertia are what you would expect with any high-end disc (I previously had a Zipp Super-9...). For the cost you can't complain. Seems very good value.