Not strictly true @wammers :
LR specify and fit a 235 mm tyre to the Discovery 2 on a 7J rim.
The tyre wall side height ratio has a factor on the rim width....
Cheers
Yes indeed, as they recommend other sizes for fitment to other sized rims that also fall outside the recommendations on the site i posted. But they will be within the spectrum of the vehicles type approval certificate for construction and use regulation purposes. Fitting odd sized none recommended tyres to road vehicles can render them illegal as far as those regs go. Fitting tyres with a larger rolling radius that those recommended will almost certainly render the speedometer illegal. Some day VOSA and our friends the police are going to have a bloody field day.