I put a set of new Michelin Cups onto a set of CSL's car today and took the Z4MC out for good run on country roads. All I can say is what a revelation. The grip is outstanding and markedly improves the cornering speed, braking distances and standing starts. The car feel beautifully settled on the 265/30, 235/35 combination as well. Once the tyres are scrubbed in properly I would expect them to be even better and even though it's early days on the Cups I would already say it's the best money I've spent on the car so far, well worth considering as a performance upgrade. All I need now is a long dry summer to save me changing between the Cups and the PS2's too often.