The 65s have a diameter of 25.5 when new, the 60s 24.7, so a gain in 0.8 of an inches or in terms of ride height only 0.4 of and inch or about 10mm.
I currently have AVON CR5 205/65 15's and have a nice ride height. If you pop out to the garage and measure from th ground the to chassis rail at the back axle each side and the centre point of the tube on the header frame to the ground, I can do the same and we can compare ride heights.
I was actually thinking of going to 60's next time, but we'll see.
