I will soon (hopefully May) trade my Model 3 in for a Model Y.
I have an 18" steel spare wheel for my M3, with a tyre size of 135/80 18.
I understand the tyres on the MY 20" induction wheels are 255/40 20.
I am assuming the hubs/stud PCD, are the same on both cars.
I'm having difficulty (I'm old) working out the rolling diameter of each wheel, as I'm not sure what/how the aspect ratio on the tyres change things. Could some knowledgable person tell me if I could use my 18" M3 spare on my 20" wheeled MY safely or would the rolling diameters be too far apart? Could it do any damage (differential etc) to the car if the rolling diameters are too far apart?
I have an 18" steel spare wheel for my M3, with a tyre size of 135/80 18.
I understand the tyres on the MY 20" induction wheels are 255/40 20.
I am assuming the hubs/stud PCD, are the same on both cars.
I'm having difficulty (I'm old) working out the rolling diameter of each wheel, as I'm not sure what/how the aspect ratio on the tyres change things. Could some knowledgable person tell me if I could use my 18" M3 spare on my 20" wheeled MY safely or would the rolling diameters be too far apart? Could it do any damage (differential etc) to the car if the rolling diameters are too far apart?