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7.30.1 - Wheel sizes ( Lasse Schauman,  December 3, 2001 )

According to dealers, you can fit Jaguar's 15" or 16" wheels as you wish which means that newer wheels can be fitted on older cars. This will, however, affect the tyre size. Some wheels might not only be larger in diameter but also wider requiring a wider tyre, as well.

What you should be cautious about is the total diameter of the tyre. If there are too great variations in this, your speedo will display incorrect speeds. Also, be aware of not fitting tyres too large in diameter (an added problem with this is that too large ones won't fit in the spare wheel space in the boot).

You can calculate the diameter of the tyre as follows:

The hight of the tyre wall (=how much tyre you can see from the side) is a percentage of the tyre width. This is stated e.g. as 205/70. This means that the tyre is 205mm wide and the hight is 70% of 205=143,5mm.

If you have a 15" wheel the diameter of the wheel is 381mm. Thus, the total diameter of the tyre is :

143,5 + 143,5 + 381=668mm.

If you go for the 16" wheels the diameter is 406,4mm. If you wish to keep the original diameter your tyres should be :

668 - 406,4=261,6mm/2=130,6mm.

If the tyre width is still 205mm the profile is 130,6/205x100=63% or about 65. So you should find tyres with the size mark 205/65R16.

I don't think there is such a size so you'll have to find wider tyres, e.g. 225's. The size would then be 225/60R16 (total diameter 676,4mm).

However, the difference in comparison with the original diameter should not be greater than 5% and please be aware that there could be some differences in exact measurement from one manufacturer to the next... just like shoes !

For more on tire size, the Tire Rack ( one of the largest tire retailer in the US ) has a lot of info along with comparison and test.


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