yes, flo should be faster.

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter

minimal? or pretty significant?

hard to say as that clincher version of the old zipps wasn't featured a lot in wind tunnel tests, I think there was a reason for that!

I think it would be pretty significant, but can't be sure.

If you like to use narrow tires and bike pretty fast (short events or lots of talent), then not so significant, since yaw angles would be low.

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter

i just race half iron and avg around 19.5-20

Had the older Zipp 404s, and have the new Zipp Firecrests. Would say that changing a tire on the newer wider rims is hands down easier. I hated the old Zipps for that reason. I would imagine the Flo performs better too, compared to the old Zipps.

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Colorado Triathlon Company, CO2UT 2021, Crooked Gravel 2022, Steamboat Gravel 2022

At that speed you won't see to much change.

I disagree, any wind and you will see a decent amount of yaw at those speeds.

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter

Ok then define the amount in time......not much.

I'm tempted to pick up a FLO 90 front for next year. I have a 2010 404 front now. BBS showed it lowered my CDA by 0.0033. At the same TSS, it actually predicted it would drop 3 minutes off my time for Kona.... though I think it's a bit optimistic on it's predictor and can;t accurately model the winds picking up and kicking your ass on the return leg. But the time savings is probably not too far off.

Hmmm.... Very appealing. Add a few more position tweaks and maybe a tririg front brake.... and if really ambitious, maybe a new front end.

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TrainingBible Coaching
http://www.trainingbible.com

Allright, summoning the power of best bike split and a lot of educated guessing I would say 20 seconds per 40k +/- 15 seconds with a 5mph wind.

About 50% more with a 10mph wind

Things might tend toward the high side of my guess with the pre-firecrest clinchers because their shape was compromised compared to the tubulars, see for instance:

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter