Motoring Discussion > Increasing tyre pressures by 20% for economy??? Miscellaneous
Thread Author: Jacks Replies: 39
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 Mon 26 Apr 10 17:08 
 Increasing tyre pressures by 20% for economy??? - Number_Cruncher
>>there is no way you can possibly derive one from the other in a straight scale like that.

Actually, it's not that far wrong.

For equilibrium at the contact patch, pressure ~= force / area

The force is the vertical load, the pressure, the pressure of the air in the tyre, and the area, that of the contact patch.

Yes, there's a bit of fudging because the tyre has some rigidity of it's own rather than being wafer thin like a balloon, but, this local rigidity of the rubber doesn't dominate at the levels of load that are in the contact patch. If the local rigidity did dominate, tyres wouldn't be effective in providing cushioning against bumps in the road.

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 Messages Author Date
 Increasing tyre pressures by 20% for econo..  Jacks 26 Apr 10 14:46
 Increasing tyre pressures by 20% for econ..  idle_chatterer 26 Apr 10 15:28
 Increasing tyre pressures by 20% for econ..  Old Sock 26 Apr 10 16:23
 Increasing tyre pressures by 20% for eco..  Zero 26 Apr 10 16:43
 Increasing tyre pressures by 20% for ec..  Old Navy 26 Apr 10 17:06
 Increasing tyre pressures by 20% for..  Number_Cruncher 26 Apr 10 17:08
 Increasing tyre pressures by 20% for e..  Zero 26 Apr 10 17:31
 Increasing tyre pressures by 20% for..  Old Sock 26 Apr 10 17:36
 Increasing tyre pressures by 20% fo..  Zero 26 Apr 10 17:45
 Increasing tyre pressures by 20% f..  Tigger 26 Apr 10 17:49
 Increasing tyre pressures by 20% ..  Zero 26 Apr 10 18:01
 Increasing tyre pressures by 20%..  Runfer D'Hills 26 Apr 10 18:26
 Increasing tyre pressures by 2..  Boxsterboy 27 Apr 10 12:41
 Increasing tyre pressures by 20% for..  Number_Cruncher 26 Apr 10 19:20
 Increasing tyre pressures by 20% fo..  Lygonos 27 Apr 10 02:27
 Increasing tyre pressures by 20% f..  idle_chatterer 27 Apr 10 12:07
 Increasing tyre pressures by 20% for eco..  mikeyb 27 Apr 10 18:57
 Increasing tyre pressures by 20% for econ..  FotheringtonTomas 27 Apr 10 13:02
 Increasing tyre pressures by 20% for eco..  Dr_Rubber 27 Apr 10 13:18
 Increasing tyre pressures by 20% for ec..  Lygonos 27 Apr 10 14:55
 Increasing tyre pressures by 20% for e..  Jacks 27 Apr 10 15:44
 Increasing tyre pressures by 20% for..  Oldgit 27 Apr 10 16:17
 Increasing tyre pressures by 20% for..  Old Navy 1 May 10 09:21
 Increasing tyre pressures by 20% for ec..  FotheringtonTomas 27 Apr 10 16:18
 Increasing tyre pressures by 20% for e..  Oldgit 27 Apr 10 19:03
 Increasing tyre pressures by 20% for e..  tyro 27 Apr 10 19:17
 Increasing tyre pressures by 20% for..  Armel Coussine 27 Apr 10 19:26
 Increasing tyre pressures by 20% fo..  Brentus 27 Apr 10 23:23
 Increasing tyre pressures by 20% f..  Number_Cruncher 28 Apr 10 00:28
 Increasing tyre pressures by 20% ..  Dr_Rubber 28 Apr 10 19:50
 Increasing tyre pressures by 20%..  Cpt. Flack 1 May 10 00:15
 Increasing tyre pressures by 20% for econ..  L'escargot 1 May 10 07:24
 Increasing tyre pressures by 20% for eco..  Iffy 1 May 10 08:07
 Increasing tyre pressures by 20% for ec..  L'escargot 1 May 10 09:38
 Increasing tyre pressures by 20% for ec..  Jacks 1 May 10 11:58
 Increasing tyre pressures by 20% for e..  Iffy 1 May 10 12:40
 Increasing tyre pressures by 20% for eco..  Baz 1 May 10 08:11
 Increasing tyre pressures by 20% for ec..  Hard Cheese 3 May 10 08:07
 Increasing tyre pressures by 20% for e..  Perky Penguin 5 May 10 12:09
 Increasing tyre pressures by 20% for..  FotheringtonTomas 5 May 10 13:07
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