Tyre Width

How do i find out what width tyres i need, what numbers on my tyre sidewall tell me the width……

Usually the first 3 numbers on a tyre sidewall indicate the tyre width, for example 165 / R14 79T
In this example the tyre width is 165mm.

The following table can be used as a guide highlighting the recommended tyre widths for given rim widths useful when considering changing rims and buying new alloy wheels that may be different widths to the current one’s fitted to your car.

Rim width
Min tyre width
Ideal tyre width
Max tyre width
5 .0 inches
155 mm
165 or 175 mm
185 mm
5.5 inches
165 mm
175 or 185 mm
195 mm
6.0 inches
175 mm
185 or 195 mm
205 mm
6.5 inches
185 mm
195 or 205 mm
215 mm
7.0 inches
195 mm
205 or 215 mm
225 mm
7.5 inches
205 mm
215 or 225 mm
235 mm
8.0 inches
215 mm
225 or 235 mm
245 mm
8.5 inches
225 mm
235 or 245 mm
255 mm
9,0 inches
235 mm
245 or 255 mm
265 mm
9.5 inches
245 mm
255 or 265 mm
275 mm
10.0 inches
255 mm
265 or 275 mm
285 mm
10.5 inches
265 mm
275 or 285 mm
295 mm
11.0 inches
275 mm
285 or 295 mm
305 mm
11.5 inches
285 mm
295 or 305 mm
315 mm
12.0 inches
295 mm
305 or 315 mm
325 mm
12.5 inches
305 mm
315 or 325 mm
335 mm