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Originally Posted by manveet  don't the OE recommendations get invalidated and we are thus supposed to reduce the psi. |
Come to think of it, should we not increase the psi for wider tyres, to maintain the same contact area ? I mean, the width is anyway increasing, so we've got to reduce the length which should be possible by increasing psi ? When I changed from 185/65 to 195/60, the tyre shop pumped in 30psi. The recommendation for the OEMs was 25-29.
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I believe that the OEM does a lot of research to come with appropriate psi figures - I realized this a couple of years back while getting air filled in an Accord - Honda has recommended a different psi for EACH of the tires - varying from 28-33.
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.. do Accord owners on the forum follow this ?
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This may be OT, but I'd really appreciate if anyone could advice if there a scientific method that tells us by how much the psi should change based on the changes we make to tire sizes? Ishan, you there ??
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It should be possible to calculate based on the car bible formulae. We can probably assume a weight for the vehicle and back-calculate.
Btw, OT, does Ishan really have something to do with tyres ? I recall a vehement denial in his signature sometime ago. Must say am not aware why he did so.