Question

why do you need to change the tyres when it's treading is worn out

Answer 1

it is needed to change as its grip is lost

Answer 2

Hey Mate
Here is your answer

We need to change the tyres when it's is worn out due to these reasons:

===≥ The person cannot drive the vehicle without a wheel and thus makes him difficult for driving.
====≥ This may sometimes cause fires and a threat to engine.
====≥ This may reduce the grip of the vehicle which can cause heavy damage.

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