Tyres & profile?

[adonis]

I have a set of 18s in 9.5j and 10.5j and am thinking of going for 215/35 fronts and 245/35 rears. :shifty

Im just wondering do I need to change the rear profile? say 30 or does it not matter? Cant remember who told me before that the profile needs to be different or something?

any ideas guys? cheers :confused

EDIT: Just realised you cant buy 245/30, DOH! :rolleyes

[frey328is]

just go to a tire size calculator online. you can punch in any numbers and they will tell you all the sizes. But then again sizes will varry somewhat from brand to brand.