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I wish to change my car tyre size from 215/65R16 to 225/55R16. Is this okay?
Answer: When changing tyre sizes, it should remain the same height (outer diameter of the original tyre), or it should not exceed the original height by more than 3 per cent.
Anything more than that will not only compromise the braking efficiency, but it will also affect the accuracy of the speedometer beyond the accepted level.
A change from 215/65R16 to 225/55R16 is equivalent to a more than 4.5 per cent change in tyre height of the original tyre, which is not recommended.
Automobile Association of Singapore
 
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