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Wheels...
Last Post 04/08/2022 07:10 PM by Frederick Jones. 25 Replies.
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Dale

Posts:1767

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04/08/2022 10:18 AM
105 rule? Until now I thought that had something to do with the minimum Shimano level one is allowed to use on a group ride without shame.
Cosmic Kid

Posts:4209

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04/08/2022 10:26 AM
do you know of any studies of asymetrical aerodynamics?


I don't, but as you note, more and more studies are leading to better understandings of the "real world" impact of yaw and IIRC, deeper rims yield smaller and smaller benefits the deeper you go. So if you have a wheel / tire combo that adheres to the 105 Rule and is only 35mm deep, you are still probably getting the vast majority of the aero benefits of a deeper wheel.

I also know that hunt has an aerodynamicist on staff full-time and she seems very smart....heard her on on podcast a few months ago.
Just say "NO!" to WCP!!!!
huckleberry

Posts:824

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04/08/2022 10:33 AM
I'll have to see if I can somehow get in touch with her and see what she has to say, because Hunt has a wheel for gravel that is 24/28 spoked which would be good for my size of human, it is a slightly asymetrical 35mm carbon rim that is 25mm internal and 31 external - not bad, unless the aerodynamics actually hinder the speed. BUT, given all the different directions that the resistance is coming from in the real world, one might think(hope) that there would be some benefit.

Dale, I'm not familiar with that rule - what's Shimano? ; )
Cosmic Kid

Posts:4209

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04/08/2022 10:41 AM
Until now I thought that had something to do with the minimum Shimano level one is allowed to use on a group ride without shame.


🤣🤣🤣

The 105 rule says your rim width needs to be 105% of your tire width for maximum aero benefit. Anything less than that, and aero is degraded.
Just say "NO!" to WCP!!!!
Dale

Posts:1767

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04/08/2022 11:51 AM
How is that measured, tire inflated and measured with a mic, or by advertised spec; 28mm tire on a ~30mm rim?
Cosmic Kid

Posts:4209

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04/08/2022 01:07 PM
tire inflated and measured with a mic


This.
Just say "NO!" to WCP!!!!
huckleberry

Posts:824

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04/08/2022 02:23 PM
Sent Luisa Grappone an email regarding aerodynamic properties of asymetrical rim profiles. We'll see if she responds or I need to translate my email into Italian ; )
Cosmic Kid

Posts:4209

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04/08/2022 03:03 PM
You should be OK....she speaks excellent English and lives in the UK. 😉😉😉

here is the podcast I heard her on.....

https://cyclingtips.com/2021/11/nerd-alert-podcast-aero-gravel-wheels-are-coming/
Just say "NO!" to WCP!!!!
huckleberry

Posts:824

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04/08/2022 03:18 PM
Thanks CK... Thoughts on hookless rims for the road, under a 190lb rider?
Cosmic Kid

Posts:4209

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04/08/2022 04:21 PM
I think as long as you are running approved tires and are keep the pressure within recommended ranges, you should be fine. Would definitely check and see what tires are approved and recommended PSI according to the manufacturers and see if it works for you.

Just saw a case where Rene Herse is getting sued because one of their tires blew off a hookless rim, but the rider was not using an approved tire on the hookless rim.
Just say "NO!" to WCP!!!!
longslowdistance

Posts:2880

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04/08/2022 07:10 PM
JMO, but maybe Jan could be, tongue in cheek, sued for his truly awful engineer on steroids meets space cadet prose that frankly insults the English language.
And he oversold his fragile tires.
But sued for the idiocy of others? That's just wrong. Best wishes to him.
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