Can a spare tire still be used after eight years?

[VivienneMarie]

A spare tire that has been stored for eight years should not be used. Generally, tires must be replaced after more than 5 years or 80,000 kilometers. Whichever comes first between "5 years" and "80,000 kilometers" indicates that the tire's service life has expired and replacement is necessary. Here is additional information: 1. Since tires are rubber products, prolonged storage can also lead to aging. Therefore, regardless of whether the tire appears brand new, it should be replaced after 5 years of use. Do not artificially extend its "service" life just because it hasn't been used. 2. After the rubber of a tire ages, the cohesion between molecules deteriorates, and the tensile strength naturally decreases. Although the tread has steel belts and the sidewalls have ply layers that provide some reinforcement, the overall strength of the tire is significantly reduced. Driving on normal flat roads might not pose a problem, but once subjected to impacts like hitting potholes or running over stones, the tire is prone to blowouts. Abnormal tire pressure also increases the likelihood of blowouts.