New Tyres today

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Well it originally had that size tyre and according to my handbook 235/70 should be used with 7J x 16 wheels.

Am I wrong?
 
This made me check mine on my '98 2.5 dse auto.

255/55R18

Then remembered that previous owner has changed the wheels for later ones.

As these wheels are 2 inch bigger, might expalin why my MPG figures always read worse than they feel.
Will have to get sat nav rigged up and check distance/speed with what the car thinks it is doing.
 
This made me check mine on my '98 2.5 dse auto.

255/55R18

Then remembered that previous owner has changed the wheels for later ones.

As these wheels are 2 inch bigger, might expalin why my MPG figures always read worse than they feel.
Will have to get sat nav rigged up and check distance/speed with what the car thinks it is doing.

Depends what tyres are fitted, 18" wheels are also used as standard on the P38. 8J/16s use 255/65 tyres, 8J/18s use 255/55 tyres. Both give same rolling radius. So speedo readings and fuel computer readings are the same. If you have different aspect ratio tyres fitted that would throw the speedo and fuel computer readings out.
 
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