As in the title really guys. Any thoughts on the following specs for alloys that are not matched exactly when fitted to a quattro. Normally one wouldn't run different front to rear dia rims but is there any threshold on the sizes etc. as below. well rims are both 20" but running different tyre width so sidewall profile is relavant . Do these specs seem a bit too far out for permanent 4wd quattro setups. Most concerned re the last two, circumference and revs per mile.