Aerodynamics / Aerodynamic Cost / Aero parts

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gbj_tester in reply to @Hovis

But surely the difference is seriously marginal

If @dan can do as well as the best rider in the Cervelo test, he could score 0.007m² off his C_dA by swapping from 172.5mm to 165mm. Not sure what your definition of "seriously marginal" is, but over 2% drag reduction (assuming he's already at <0.35m²) is not to be sniffed at.

Of course, he might be like Rider 1 and increase his drag by just as much, which is why nobody can give him a definitive answer without testing.

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Hovis in reply to @gbj_tester

0.007m^2? So just so I can picture that, thats an 8.3cm x 8.3cm square reduction. I don't understand how that's possible with a 7.5mm reduction in crank length. Am I missing something?

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umop3pisdn in reply to @Hovis

CdA isn't just about A.
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gbj_tester in reply to @Hovis

Am I missing something?

You're probably missing the fact that they raised the saddles to keep leg extension the same for all crank lengths, but didn't touch the bars. That effectively increased the saddle to bar drop, which would have changed the torso angle.

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