Whats The Max Difference In Tyre Od?

[Owgasm]

Hello,

Just finding some new tyres to match my 285/30/18". They are Yokohama advans with a OD of 629.

I am just wondering for a GT-R as it is 4 wheel drive, whats the biggest difference in OD? or must it be the same all round?

Thanks for your help.

[Owgasm]

Anyone?

Is 14mm difference a problem?

[bluey33]

Same all round will of course give better treadwear. The large/smaller OD will change the gearing of the drive and treadwear a little so i wouldnt do too much.

I have read somewhere 3% max difference.