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Message: <blockquote data-quote="ichiwan2" data-source="post: 77577" data-attributes="member: 153">There is an optimal tyre pressure recommended for the e30 - there should be a sticker somewhere at the door pillar.  There is room on either side of the recommended tyre pressure.  However, you must not exceed the maximum tyre pressure that is indicated on the tyre.5 years is the general guide.  I did find that the grip reduces with time - not because of shallower tread.  My F1s had about 4mm of tread left and I was sliding a lot.  Changed them.Generally, the rubber on the tyres tend to harden with time, due to heat cycles, i.e., it gets hot due to friction with the road as well as internal friction as the tyre flexes.  As it hardens, the propensity to crack is higher.  Hence, the chances of the tyre blowing increases as the tyres get older.As you love high speed cornering and driving, I strongly recommend that you change the tyres.  It will keep you, your passengers and other motorists safer. If you do decide to keep the using old tyres, the old saying penny wise, pound foolish comes to mind. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>