12. The tyre manufacturing companies check its durability by rotating the tyre off the road using an
endurance test machine and measuring the distance covered by it till it is damaged. If the radius of a
wheel is 15 cm and it makes 50,000 revolutions before getting damaged, then find the durability of the
tyre.
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Just take a 20p coin and insert it into the tread grooves on the tyre. If you can't see the outer band on the coin, your tyres are above the legal limit. However, if you can see the band and that section of the coin is still visible, your tyres could be unsafe and require professional inspection by a mechanic.
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