hmm, will the people who bought the car help you out?
pay them like $50 to come for a day
but yea
2piR=cirdumference
and your speedo will be wrong, it measures angular velocity (w), not linear velocity (v)
so it has a set group of measurements to calculate the linear velocity using the angulare velocity and the radius
so say W=5 radians/second
and your old wheels and tires had a Radius of 15cm
then V=W x R
5 r/s x 15cm
75cm/s is how fast your going
and the new tires are 20cm in radius
so it would be 5 x 20 or 100cm/s, but the speedo would still show 75, becase it uses W going into a calculator of constants
