Then, measure the distance from bottom rim (6 o-clock position) to road surface for each tire.Then, increase the pressure in all 4 tires 10%.Repeat several times, until the line wear is indeed flat on all tires. Increase or reduce pressure to make the wear of the lines "flat" across the tire.After applying chalk, drive forward and backward 50 ft, then inspect the chalk lines.The procedure, however, is a bit more complicated than two words can describe. There are several sites on the 'net that describe the Chalk Test. Mayby even 20% of the given maximum load should be substracted to be save to laws of nature. Will give picture of that because tires on cars on this forum often also have this. Once got hold of the official European formula, wich USA stepped over to for only SL and XL// as late as 2006, when the Ford/Firestone affaire was rounded off and forgotten)Įven made my own universal formula of wich USA and EUR official can be made by putting other power in and construction load zero, but also an alternative one described by an American IR J.C.Daws, wich is linear with a constructionload,ĭetermined my own settings for that formula, to my opinion comes closest to the ever to be constructed ideal formula to laws of nature.Įven am busy with a replacing system for higher speed ( and lower speed) then the maximum load is calculated for.Īlso concluded of the F/F affaire that those tires where offroad-looking, and had large profile blocks that cover a part of sidewall, so lesser sidewall able to flex, wich courced to much heat and so tire damage. I am able to calculate a save lowest pressure for you but need more data. The 51 psi is the maximum allowed cold pressure of your most likely SL tire. The 36 psi is the AT-pressure of a SL eurometric tyre, and mostly given as standard advice by tire-specialists. So your 30 psi advice is most likely calculated for the GAWR, and for lower loads, so normal driving with only driver, can even be lower. LT tires ( Euro system C(omercial)-tyres) only give AT-pressure and sometimes write maxpress behind it, but higher pressure is allowed. lets call it AT-pressure furtheron, is not the maximum cold pressure of a tire. Click to expand.The car maker detemines the weights on axles and for those loads they let the tire maker calculate a pressure, atleast before the year 2000.Īfter the year 2000 ( no coincidence around the Ford/Firestone -afaire, rear was mostly kept at maxloadpressure ( Standard load 36psi EUR /35psi USA) or even maximum allowed cold pressure as given on SL and XL /reinforced/Extraload tires only ( between 44 and 51 psi for SL and XL sometimes even 60 psi).
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