Technically, is this a frontdoor or backdoor brag?

Yes.

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http://bikeblather.blogspot.com/

Well earned brag at that.
Thanks for all of the data and sharing your thoughts.

what do you reckon your CdA would be if you buried yourself on the tops?

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Eric Reid AeroFit | Instagram Portfolio
Aerodynamic Retul Bike Fitting

“You are experiencing the criminal coverup of a foreign backed fascist hostile takeover of a mafia shakedown of an authoritarian religious slow motion coup. Persuade people to vote for Democracy.”

Dunno...but, based on my experience, it probably would be a bit harder to maintain a "fixed" position and get stable data. As tedious as I think field testing can be, being a "wind tunnel test dummy" is a bit of a drudge as well :-/

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http://bikeblather.blogspot.com/

And if a lot of ST folks took the time to do some testing they'd find that their triathlete CdA is higher than that...

A lot of triathletes have spent a lot of money to get aero but are still pushing way too much air with the most important component of all, the body...

Not just age-groupers, but pros too...For example, I witnessed a pro triathlete (one who recently finished fairly high up at Kona) register a CdA higher than that in a wind tunnel not long ago...

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Which pro was that if you can answer?

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I'd rather not say (since it wasn't MY wind tunnel session)...but some of you may be able to figure it out ;-)

edit: Plus it was a few years ago, and this pro is now on different equipment (maybe different position?) and may have a lower CdA now...but, the pro obviously has a huge "engine" since they were a top pro already at that time.

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http://bikeblather.blogspot.com/

Well there is no way it could be Brent or Tim, they are just too small IMO. I guess it could be Rappstar himself or Hoff but they both look pretty good despite be Jordan being like 6 4 with long legs. I guess I would me be most excited if it was Brent. That would give me some confidence that I need myself need to get to the tunnel.

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It wasn't Jordan...and I don't think I said it was necessarily a male ;-)

I'll narrow it down for you slightly...this athlete finished in the top 7 this year.

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http://bikeblather.blogspot.com/

Interesting results. The pictures of you on the 2 bikes look like you have more reach on the Stinner, which reduces the big wrinkle in the jersey and might narrow elbows. My eyeball wind tunnel makes me think that this favors the Stinner results.

I also can't wait to see your Crr results for the Specialized Turbo 22. Velo just published tests that put it slightly ahead of a GP4000. Maybe we will have a new best all-around tire.

You have a "keen eye" ;-)

The reach to the drops on the Venge was slightly shorter, but it wasn't my bike to go swapping stems on.

It was actually quite interesting how close it was otherwise...we basically just adjusted saddle height.

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http://bikeblather.blogspot.com/

It would be interesting to see how low your road cda would go with a lower head position. It looks quite high in the pics.... at least for what it could be....potentially..

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24 Hour World TT Champs-American record holder
Fat Bike Worlds - Race Director
Insta: chris.s.apex

That Stinner is a really pretty bike. It kinda reminds me of something Rob English would build. Simple yet elligent.

...or, with a skinsuit...or smoother shoes...or, a different helmet? Lots of things to still try out.

Actually, from what I've read, that LG Course helmet actually does fairly good job at that head angle...not so much at lower angles.

BTW, during the testing, I attempted to keep a consistent head position by staring at a particular level on the tunnel intake wind screen. So, that may or may not actually represent the "average" position I hold my head during typical riding.

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http://bikeblather.blogspot.com/

Thanks, that was our intent. Aaron was great to work with and this was a good project for him to try out some things he might otherwise not have ventured.



Is that a mash-up of elegant and intelligent? I like that :-)

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Here's how it looks in "normal riding-around mode" ;-)

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Out of curiosity, can I ask why the GP4000s II tire was not in the result set? Did you use it in the test?

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Chris Thornham
Co-Founder And Previous Owner Of FLO Cycling

Mostly because of time constraints and not personally having a "fresh" one on hand...plus, especially for the Flo 90, I was more interested in tires I would possibly run in a TT. Personally, it's not going to be a GP4000S...I'm not as "flat averse" as some folks are (especially for a front tire) and with lower yaw angles experienced, low Crr tends to win out...as can be seen here: http://bikeblather.blogspot.com/...sheriff-in-town.html

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http://bikeblather.blogspot.com/

Hey Tom,

Are you going to let us know what tire is faster when you combine aero with Crr? I keep checking your blog for updates ;)

Much appreciated.

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/kj

http://kjmcawesome.tumblr.com/

Ok thanks for the info. That data is interesting. We need to talk soon.

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Chris Thornham
Co-Founder And Previous Owner Of FLO Cycling

Tom, thanks for sharing this information.

If I'm interpreting things correctly, the SS23 may be the fastest / most aero combination. Just curious, do you think the aero gains of a SS20 are enough to offset what is given up in Crr to be a faster front wheel option?

It's coming...soon :-)

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http://bikeblather.blogspot.com/

Next year I'm contemplating the SS23 for my front and either the Conti Force or one of the Spec Turbos in 24c for the rear.