LOW
I have changed the tyre size to 165 on my plus 4 and it gives greater ground clearance by 10mm all round, no change in normal and fast road driving except for greater comfort and I have checked the speedo against sat-nav and it reads absolutely spot on accurate as most speedo's are designed to read slightly under true speed.to accomodate worn out tyre circumference. Result, I'm totally happy with the change.
