now a diesel head..
AO Silver Member
Join Date: Sep 2014
Location: United Kingdom
on the BMW Scene its fairly common to have a wider track at the back, my e36 does, but RWD responds very differently to this than our FWD cars..
I would stay the same on all four corners on the GT as the benefits of having a wider track on the rear are somewhat negated by a narrower track on the drive wheels.
just my tuppence and anecdotal from my experience with experimentation with tyres on both FWD and RWD cars.
you also have the unsprung weight issue of extra rotational momentum with bigger wheels /tyres, that MAY have a small effect on accleration and braking.
I am aware you are conscious of getting the best out of your car Damien, hence considering using millers nanotech,as well as considerable upgrades and mods.
that's real attention to detail so its worth applying the same idea when you consider wheel and tyre sizes.
I have no maths or science to back any of this up just personal exerience.
p.s what do you want to do about those tyres mate?.