The E90 BMW M3 is something of a unicorn in the M3 ... As such, this example has 19-inch staggered wheels (meaning the wheels and tires are wider in the rear than in the front), a 1-centimeter ...
Underneath the M3 CS Touring is a set of adaptive M Suspension dampers, which BMW says is model specific. Those dampers manage a pair of 19-inch wheels in the front and 20-inch rims in the back.