*Tour Aero Bike Tests*

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toxin
Posts: 899
Joined: Tue Apr 18, 2023 5:56 pm

by toxin

You are making this way more complicated than neccessary, this isn't a windtunnel test

CR987
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by CR987

refthimos wrote:
Mon Apr 15, 2024 6:26 pm
aeroisnteverything wrote:
Mon Apr 15, 2024 5:34 pm
Why this guessing on causes? Just swap bikes if you are both similar size, and do the same rolldown - see what happens.
The two bikes would need to be set up exactly the same though (stack, reach, bar width) and even then, you would need to test same rider on the two bikes, because using two different riders introduces way too many additional variables.
Like I said, very very similar size, weight, height. We're both in a full aero tuck. What it does illustrate is that the margins really are that minimal

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rockb
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by rockb

swap the bikes, and report back here, THX

toxin
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by toxin

helmet and clothes fit are probably making making a big difference here

CR987
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Joined: Sun Jan 26, 2020 10:37 am

by CR987

toxin wrote:
Mon Apr 15, 2024 8:43 pm
helmet and clothes fit are probably making making a big difference here
I can assure if there is a difference then my clothing would be more aero than his. The fact that we have to look as such small variables shows how little difference the frame actually makes

Noctiluxx
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by Noctiluxx

CR987 wrote:
Mon Apr 15, 2024 9:50 pm
toxin wrote:
Mon Apr 15, 2024 8:43 pm
helmet and clothes fit are probably making making a big difference here
I can assure if there is a difference then my clothing would be more aero than his. The fact that we have to look as such small variables shows how little difference the frame actually makes
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toxin
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by toxin

Well clothes can be one of the biggest gains because they cover the thing that generates the large majority of the drag... your body

refthimos
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by refthimos

CR987 wrote:
Mon Apr 15, 2024 7:51 pm
Like I said, very very similar size, weight, height. We're both in a full aero tuck. What it does illustrate is that the margins really are that minimal
The Tour tests (and other testing) do indeed support your conclusion that the margins between framesets are indeed (rather) minimal, at least when compared to total system drag. But your experience with your friend does not.

Even assuming everything on your bikes other than framesets is completely identical (e.g. are you running the exact same tires and PSI? the difference in Crr alone can indeed be indeed more more than the CdA difference between your two frames), it's impossible to "eyeball" bodies and reach an accurate conclusion on their CdA.
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spdntrxi
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by spdntrxi

dont take it too serious. he's just measuring "Ds" with his bud basically D for Drag... anyways you all might be same-ish build but some people are just heavy. I rarely run into people with my build within 10 pounds of me. Yeah good for football, but bad for my now chosen sport of cycling.
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wheelbuilder
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by wheelbuilder

True story.....
This forum has become patently ridiculous.
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CAAD8FRED
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Joined: Mon Jun 18, 2018 10:52 pm

by CAAD8FRED

Any update to the new Ostro or new BMC being in the test?

pmprego
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Joined: Mon Jan 21, 2019 3:16 pm

by pmprego

CAAD8FRED wrote:
Mon May 06, 2024 1:41 pm
Any update to the new Ostro or new BMC being in the test?
:up:

charon
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Joined: Tue Apr 30, 2024 10:20 am

by charon

CAAD8FRED wrote:
Mon May 06, 2024 1:41 pm
Any update to the new Ostro or new BMC being in the test?
I emailed them asking if and when we could expect a review of the Ostro and they replied that they will be testing bikes in the wind tunnel again in autumn but are unsure whether they will get an Ostro to test.

Yoln
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by Yoln

charon wrote:
Mon May 06, 2024 2:59 pm
CAAD8FRED wrote:
Mon May 06, 2024 1:41 pm
Any update to the new Ostro or new BMC being in the test?
I emailed them asking if and when we could expect a review of the Ostro and they replied that they will be testing bikes in the wind tunnel again in autumn but are unsure whether they will get an Ostro to test.
Reading between the lines "Factor is a German company and we don't like to post fake numbers, so it's better for everyone to not test the Ostro".
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X5SAE
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by X5SAE

Yoln wrote:
Thu Jun 06, 2024 7:16 pm

Reading between the lines "Factor is a German company and we don't like to post fake numbers, so it's better for everyone to not test the Ostro".
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