On Oct 23, 3:30 pm, rebco10 > wrote:

> The tires on the M3 were equal wear to the ride on the Vette. The 65%
> worn tires are not going to have that much affect on the feel of the
> car, the suspension travel and the rigity of the package. It will
> have a part.
>
This is not accurate. Tire performance is not all about tread depth.
7 year old tires worn 65% will not perform the same as 1 year old
tires worn 65%.
7 year old tires should not be on any sports car regardless of tread
depth.
Tires play a HUGE role in the way a car feels.

Years ago I taught my kids this lesson with a Toyota Corolla. On OEM
tires the car was a poor handler, it wandered at speed and was very
sensitive to cross winds and poor pavement. The ABS seemed not to work
very well. Then I put a set of high performance Pirelli tires on the
car. Everything changed. They couldn't believe it was the same car.
They wore out those Pirellis in 20,000 miles but they learned a bit
about driving.