Quote:
Originally Posted by ard
That is a great diagram and good set of numbers.
DO keep in mind you want toe *in* so positive toe. Toe out is no fun.
Actually, with the slightly larger tire up front, it will be under more weight- (unladen, the front of the x5 is WAY heavier) hence the revs per mile, the ACTUAL rolling diameter will be tad smaller. It will 'self correct' the size mismatch. Same psi front and rear, your rear will 'roll a bit taller'. IMO
Unless you are driving 600lbs in the rear plus 4 people all the time... 
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I thought when you mentioned it before it was just a mistake, but my fronts are 255 and tears are 275 so the bigger tyres are on the rear.
Also, I have the 7 seater x5 because there's 6 of us. Two bigger adults up front, two children in the very back (3rd row) and baby and child in middle row. So it's quite a change but the car will go from just me in it to 6 people.
And got it, positive toe! Negative would have my wheels trying to leave the car haha.