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| Not a Swiss thing, just a thing of someone who has clearly too much money and too less brain.
TCS recommends to replace summer tires when they have less than 3mm.
 . They also say you should not drive if the tires are older than 10 years. Normally a tiere is approx 1-2 year old at purchase. Do not accept any tire that is older than six years at date of purchase. See above post how to find production date.
My observation: tires wear down (not out) much faster at higher speeds. Older tires are harder, have less grip, and do not wear down as fast as new ones. | |
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I do not buy new tires if they are more than 3 months old, 6 years someone is having a laugh.
Winter tires have noticeably less grip after 4 years, however I never get more than 2 years out of rear tires & 3 years out of front .