this post was submitted on 20 Sep 2024
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Funny: Home of the Haha

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100% tire pressure (lemmy.world)
submitted 2 months ago by CenturionKing@lemmy.world to c/funny@lemmy.world
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[–] Tja@programming.dev 2 points 2 months ago (1 children)

Source?

All the studies I've read (and my experience) show that narrower tires and higher pressures improve economy. Less traction and less ride comfort are the tradeoffs, respectively.

[–] CookieOfFortune@lemmy.world 3 points 2 months ago* (last edited 2 months ago) (1 children)

GCN has a number of videos on this subject: https://youtu.be/jTZfrBVr5pQ?si=M5v6KP5ZZ9ZU5MXz

https://youtu.be/AK5KLvrzrb4?si=aMcYxYnWi9poZ8SA

And here is some technical data from SRAM: https://www.sram.com/globalassets/publicsites/cms-campaign-pages-not-story-pages/zipp/totalsystemeffeciency/pdf-downloads/tse-explained2.pdf

Basically new data includes vibration losses which get larger as pressure increases. There’s a sweet spot to balance between rolling resistance (which decreases with pressure) and vibration (which increases with pressure). So when you mention ride comfort as a trade off, it actually has a much larger effect than you might imagine.

[–] Tja@programming.dev 1 points 2 months ago (2 children)

Thanks for the videos and the PDF, but they are all bicycle related.

A car has a whole sophisticated subsystem dedicated for absorbing vibrations (the suspension), so I'm not sure the results can be applied there...

[–] CookieOfFortune@lemmy.world 3 points 2 months ago (1 children)

Oh I was only addressing this:

Road bicycles like the ones used in the Tour de France use pressures in the 120-140 psi range,

[–] Tja@programming.dev 1 points 2 months ago

Fair enough

[–] Malfeasant@lemm.ee 1 points 2 months ago (1 children)

Suspension is great for smoothing out low frequency unevenness, but not so much for high frequencies, like something the size of gravel- a spring will ring like a bell.

[–] Tja@programming.dev 1 points 2 months ago

That's why a suspension is much more than a spring.