92hatchLX

How much can going from the stock 225/55/16s to say a 245/45/16 change your gear ratio?

Liquid_02

Not much. might set it off a few mph at 65 but that's it, too lazy to do the math for it.

K I figured it out anyway, at 60mph you'd have a +2.6mph error, meaning, your speedo would read 62.6

AdderMk2

since the new tires you are going to are 24.6" total diameter you would actually travel slower.

the tires you have on the car are 25.7" total diameter.

If liquids math is correct, you would actually be doing 57.4 mph when your speedo says 60

Stevens91gt

well in liquid's post he does have it going slower
he said if hes goin 60..the speedo would read 62.6