Aero data from 19 wheels by Hambini

Everything about building wheels, glueing tubs, etc.
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aeroisnteverything
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by aeroisnteverything

Hex wrote:
Thu Oct 11, 2018 6:04 pm



For a grand... they are pretty good.

One can lose 220g with some Veloflexes and some exotic inner tubes like tubolitos or whatever is going on today if weight was a deal breaker.

For a grand...you get the aero benefit of most of the wheels here.
For a grand... Once you are up to speed, you won't be missing much on that weight.
For a grand... you would feel it on the climbs, but you can save that grand, buy a case, fly somewhere for a couple of days and ride on another country. For a grand
I mean, sure. You could make that case for a lot of things - value for money/speed gained for money starts deteriorating really quickly at above $3k total bike budgets. And then also: why Mavics and not Yoeleos, which are lighter at the same price point?

On the other hand, (1) this is WW, rather than slowtwich; and (2) one could go with the "all of the above" option: lighter wheels, light tubes/tubeless, light everything, and a trip to the Alps.

by Weenie


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otoman
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by otoman

aeroisnteverything wrote:
Thu Oct 11, 2018 8:02 pm
one could go with the "all of the above" option: lighter wheels, light tubes/tubeless, light everything, and a trip to the Alps.
This!!
Age and treachery shall overcome youth and skill

dastott
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by dastott

Those Mavics come with an alloy brake track, don’t they? If so, run latex tubes and descend with confidence. Worth the weight penalty to some I imagine.

are
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by are

Sorry if I missed it earlier in the thread, but are the Bontrager 50s that are included in the test the same as these:
https://www.trekbikes.com/us/en_US/equi ... Code=black

If yes, is there any reason to think that their updated profiles, which are a little bit shallower, would test significantly worse?

Super interesting thread - thanks for the publishing your work!

hambini
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Joined: Tue Nov 15, 2016 8:13 am

by hambini

are wrote:
Mon Oct 15, 2018 5:14 pm
Sorry if I missed it earlier in the thread, but are the Bontrager 50s that are included in the test the same as these:
https://www.trekbikes.com/us/en_US/equi ... Code=black

If yes, is there any reason to think that their updated profiles, which are a little bit shallower, would test significantly worse?

Super interesting thread - thanks for the publishing your work!
Unless someone gets the profile wrong, then depth is king. You won't really find much difference between wheels of an equivalent depth at reasonable speeds. If you are going TT racing and can maintain 50km/h then the profile has more of an effect.

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LeDuke
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by LeDuke

Hambini, have you thought about comparing the same wheel/hub with different spoke counts?

For example, what kind of aero penalty would I pay going from 24 to 32 spokes on a Light Bicycle 56mm rim?


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Monkeyfudger
Posts: 226
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by Monkeyfudger

LeDuke wrote:
Tue Oct 16, 2018 12:05 am
Hambini, have you thought about comparing the same wheel/hub with different spoke counts?

For example, what kind of aero penalty would I pay going from 24 to 32 spokes on a Light Bicycle 56mm rim?


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I’d be very interested in this also as I’m currently looking for a new track bike front wheel, I know the Zipp 404 track wheels has 10 more spokes on the front, as a lightweight dude I don’t feel like I’d benefit from the extra spokes but certainly “feel” from previous wheels there’d be a fairly large aero penalty.

AJS914
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by AJS914

I seem to recall reading how many watts one spoke was worth in November Dave's blog. I found this paper (can't vouch for it):

http://www.aeroweenie.com/assets/backup ... ecount.pdf

It concludes that 12 additional spokes on a Zipp 404 costs between 1 to 5 watts.

Matt28NJ
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by Matt28NJ

AJS914 wrote:
Tue Oct 16, 2018 6:39 pm
It concludes that 12 additional spokes on a Zipp 404 costs between 1 to 5 watts.

I think it's important to publish units; 1 to 5 watts at XX speed?

Hambini's units of value are very different than Zipp used.

I mention Hambini units because, well, we're in the Hambini thread :)

AJS914
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by AJS914

Until someone brings Hambini identical wheels with different numbers of spokes to test, I don't think you'll see that data.

I think the point is that the difference between a few extra spokes is very very small. The difference between 16, 18, or 20 spokes on the front is probably within the margin of error for the test.
Last edited by AJS914 on Wed Oct 17, 2018 4:46 am, edited 1 time in total.

bm0p700f
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by bm0p700f

zipp demonstrated that a few year back.

hambini
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by hambini

I'm not a wheel builder so I don't have the ability to swap spokes out and retest.

In other but related news. Two of the wheel brands who have been tested have been in touch with lawyer letters to try to get them removed from the graphs.

I've obviously touched a nerve.

Matt28NJ
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by Matt28NJ

hambini wrote:
Tue Oct 16, 2018 10:11 pm
In other but related news. Two of the wheel brands who have been tested have been in touch with lawyer letters to try to get them removed from the graphs.

I've obviously touched a nerve.

Well done; welcome to the big leagues.

Monkeyfudger
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by Monkeyfudger

Assuming they didn’t test well then... :lol:

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Calnago
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by Calnago

Lawyer letters are idle threats. Take a pic of the letters and post up here for all to see. At the very least name who is complaining.
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by Weenie


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