Many people fit their cars with wider tyres for aesthetic reasons, are there any technical advantages / disadvantages of doing so?
Although correct tyre size for normal running is the one recommended by vehicle manufacturer, For special purposes vehicle performance can be improved by selecting wider tyre with lower profile, which means maintaining same overall diameter of the tyre, lowering aspect ratio, thus increasing the tyre width. This is called up-sizing or up-stepping. There are some safety guidelines, which must be followed while upsizing, i.e., overall dimensions of the tyre must fall within certain limits.
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