Crank Aero Position?

[Downhill]

Well I've just got to ask...

Does crank position have any significant effect on aero drag?

If so, what's the best position when coasting in a straight line at high speed? 12 O'clock / 6 O'clock, or 9 and 3?

[Alex Simmons/RST]

Do some virtual elevation analysis of coast down tests and you could work it out. Need a good high frequency accurate speed logger (speed every second is just enough, provided speed data is measured to nearest 0.2km/h) and a calm day. And a hill with a flat top approach, downhill section and a flat run off area at bottom is ideal.

[brentono]

To take a logical approach, and from much observation and a lot of personal experience,
it would have to be 9 and 3!
Cheers

[JV911]

most of the pros seem to coast at 9 and 3

[DavidI]

My recollection of various magazine articles based on wind tunnel testing is that the best position is, as stated, 9 & 3.
As to whether it has a "significant" effect... well, that depends on what you consider "significant."

[foo on patrol]

Keep pedalling softy! Yep 9/3.

Foo

[Downhill]

Keep pedalling softy! Yep 9/3.

Foo

But I've run out of gears!!!

[foo on patrol]

Well try harder!

Foo

[hannos]

most of the pros seem to coast at 9 and 3

well they're wrong!

It's 3 and 9!

[foo on patrol]

^^ Idiot! ^^

Foo

[Downhill]

most of the pros seem to coast at 9 and 3

well they're wrong!

It's 3 and 9!

... but only if you're left handed!