Tyre / Wheel width combinations

[MrFlibbles]

PHers

Hands up who knows the widest tyre you could put on a 8J rim? would a 235 fit?

[kenmorton]

235/35 or 245/40 or even 255/45 will fit. There is a formula but I can't remember it.
Try this link to Toyo tyres site www.toyo.co.uk/
has recomended rim widths for all of thier tyres and they all follow the formula.

[denisb]

For normal road tyres -

Widest tyre will look the best and give better standing start type acceleration.

The NARROWEST tyre on the rim will go into, round and out of a corner faster.

If you looked at Yokohama A032R's, they are designed to go on narrow rims, and you could have the best of both.

[kenmorton]

Just found the link to the tyre bible site. Loads of info - too much to take in all in one go.
www.carbibles.com/tyre_bible.html

[GreenV8S]

The rule of thumb for normal sized road tyres is that the tread width should be the same as the rim width +/- half an inch. It is better to put a narrow tyre on a wide rim rather than the other way round. Road tyre widths are normally quoted at the widest point of the sidewall, which is typically about 1" wider than the tread. So for example 7" rim => 7" tread => 8" (200mm) nominal tyre width; 8" rim => 8" tread => 9" (225mm) nominal tyre width.

Just to add to the confusion, competition tyres are normally measured at the tread so an 8" slick would be a similar width to a 225 road tyre.

I think when you go to very low profile tyres, or very wide or narrow tyres, the figures might change slightly but the principle that the tread width should be slightly less than the rim width would still hold.