The wheels were increased in size to 19 inches. BMW took the unusual approach of supplying the CSL with semi-slick tyres (Michelin Pilot Sport Cup). These tyres provided high grip levels once warmed up on a racetrack, but poor performance on wet roads and when below their operating temperature. A warning label was included in the CSL to inform drivers about driving in cold or wet conditions. The brakes were upgraded with larger floating rotors at the front and larger pistons at the rear.