tyre sizes front and back??
 

Just wondering on tyre sizes soon to be fitting new wheels and carlton flares to my blob project, thinking of putting 285/40/18 on the back and 265/40/18 at the front... can I do this? Or can it damage the diff with different tyre sizes?

Thanks ryan

You're going to get different answers here, many will be of the ill-informed "Do it mate, it worked great on my RS Turbo..." type :(

The short answer is this: find an online wheel-size calculator, and enter the numbers above. Don't forget wheel sizes. If the rolling radii are more than 1% different, you will wind up the centre diff.

It's your car, you can take the risk if you want, of course.

HTH

Thanks for the advise

wheels are
XXR 530 18x9.75 et20

tyres front thinking 265/40/18
Rear 285/40/18
Cheers ryan

Here's the difference in rolling diameter: 669.2mm 685.2mm

That's about 2% larger.

I wouldn't, but it's up to you.........

Ok mate cheers for advise.. not sure what tyres to go for all round tho..

Can you not go 265 all round? Or does anyone do 275?

Yeah thats what im thinking of doing.. apparently some of the lads in states are running 285 all roumd no probs

play with the calc further

you listed

front 265/40/18 (try 265/45/18) etc - you'll find it'll be less 'out'
Rear 285/40/18

Ok pal cheers