I think what you see on tire walls is the maximum pressure in kPa. As the Pascal was only implemented in SI in 1971, countries that used the metric system prior to that tended to stay with the older units like Bar and kg/cm2. On the inside driver door pillar of all US cars is generally the recommended tire pressure in kPa and PSI.
Mike Payne ----- Original Message ----- From: Jeremiah MacGregor To: U.S. Metric Association Sent: Saturday, 24 January 2009 15:23 Subject: [USMA:42443] Re: Small item seen on TV Martin, My tires show kPa (psi). Is this also the way it is in the world or only the US? Jerry ------------------------------------------------------------------------------ From: Martin Vlietstra <[email protected]> To: [email protected]; U.S. Metric Association <[email protected]> Sent: Saturday, January 24, 2009 10:22:34 AM Subject: RE: [USMA:42430] Re: Small item seen on TV The most common units of measure for tyre pressures in Europe are bars or kPa. (100 kPa = 1 bar). ------------------------------------------------------------------------------ From: [email protected] [mailto:[email protected]] On Behalf Of Jeremiah MacGregor Sent: 24 January 2009 14:59 To: U.S. Metric Association Subject: [USMA:42430] Re: Small item seen on TV Harry, Aren't they suppose to be in pascals or something along that line? Jerry ------------------------------------------------------------------------------ From: Harry Wyeth < [email protected] > To: U.S. Metric Association <[email protected]> Sent: Tuesday, January 20, 2009 11:39:58 PM Subject: [USMA:42388] Small item seen on TV A minor point of interest: on PBS's US broadcast of the BBC World News tonight, in a piece re the resumption of natural gas to Europe, there was "footage" showing close-ups of presssure gauges on pipeline fixtures out in the snowy fields. One showed pressure in kg/cm2, and the other in "bar". HARRY WYETH
