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PostPosted: Tue Mar 20, 2018 4:44 pm 
North Wales Deputy AEC
North Wales Deputy AEC
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Joined: Sun Apr 30, 2006 12:50 am
Posts: 6499
What are the expected performance differences between a bigger volume tyre (say 3") pumped to the same pressure as a smaller volume tyre (say 2.4")??


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PostPosted: Tue Mar 20, 2018 5:20 pm 
Retro Guru
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Joined: Wed May 05, 2010 2:32 pm
Posts: 1622
Location: 024, The Netherlands
More contact area (resistance)?


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PostPosted: Tue Mar 20, 2018 5:41 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 9099
Location: New Forest, UK
Contact area is always the same for the same pressure - tyre load divided by tyre pressure. The tyre deforms until the two are balanced. You can weigh a car by drawing round the tyre contact patch and calaculating the area, provided you know the inflation pressure.

You can get a bigger contact area by running a fat tyre at a lower pressure, this is possible without an inefficient sagged sidewall.


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