You don’t want to drive on a flat too long or you could damage the tire and even the rim, leading to even more costly repairs. Only drive as far as you must until it’s safe to pull off the road. You May Be Wondering, “Can I Drive On A Flat Tire?” Whether it’s low tire pressure or you just found a nail stuck in it, you know the repair is going to cost you time and money. So before you go experimenting with lower pressure, first use my spreadsheets and information on my skydrive, you can navigate over it like in a forum.Oh, the frustrations that come with a flat tire. The sidewalls are the delicate parts in this, the tread can have more, though it can come loos by the to much deflection of the sidewalls. So if you have those tires, keep to the high side, wich is bad for gripp and comfort, but a blewing tire gives more damage. That maximum load is also calculated, but with a much more complex formula. īut for low aspect ratio tires ( the 30 in fi 225/30 R 18 91W XL) I have my doubts if the maximum load is calculated right, I think to high. So what you have to do is calculate the pressure with one of my spreadsheets, to see if you can go lower savely. After 2000, to my opinion as overreaction to the Ford/Firestone-affaire, this is not given anymore, for normal use now the GAWR's are used in the formula, heavy use behind even maximum of tire sometimes or Pr. But in Europe before 2000 also a normal use for 3 persons and a little load was given, wich gave for frontwheeldrive cars ( motor always in front so front more weight) a higher advice-pressure then behind. So tire pressure advice is all about load on the tire, and a bit about speed and alighnment ( alighnment seldomly needed).įor the loads the American tire makers use the Gross Axle Weight Ratings ( GAWR) to be save for every situation.
European tires mostly normal 36 psi, XL 42 psi. The calculation is meanth to give the same deflection as for referencepressure with maximum load on it.įor Extra load tires ( reinforced, XL all the same) the Ref-pressure ( further Pr) is 41 psi in America. The extra is used for higher speed and alignment ( camber angle tires like this/-\ instead of this |-| on the axle). This is not the maximum cold pressure of the tire, as they put it on modern tires of 44 to 50 psi.
The 35 psi is, as it is called in the formulasheet, the reference-pressure, so the cold pressure at wich the maximum load of the tire may be bare, up to maximum speed of tire, or if lower ( sertainly here the case) 99m/h. Then you can check it for virussus firs if you want. To download, click on the line, but not on the name of it, then in the right barr at download. To use a spreadsheet, best open it with Excell or compatible programm ( open office calc for instance), to use it fully, in the browser wont work for most of them, because it cant handle some things I use in them. This link leads to my public map of skydrive, that belongs to my hotmailcom adress with the same username as here ( combine it yourselves to contact me, spamm machines cant this way)
Live in Holland and made spreadsheets for it, and translated a few to English to go worldwide with it. Found this topic googling for "tire-pressure" because I have been busy with calculating that since 2007 of and on, with use of the formula that the European tyre-makers use and since 2005 also the American for P-tires and Extra load, and prooved to give save answers for the tires.ĭont have a lexus,so wont introduce myself in a seperate topic.
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