also, generally speaking, the higher the speed rating the better the performance of the tire; braking, handling, evasive manouvers etc besides the usual heat dissipation and top speed.

when mercedes (any manufactuere here!) is developing the car and calibrating the ABS, traction control, stability sytems and so on they know what tires will be recommended for the car. so you are in fact doing yourself a disservice by ignoring your tire salespersons advice.

of course, in 90% of your driving you will not need the extra "edge" of the higher speed rating of your tires. its the other 10% you need to worry about.

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'O=00=O'
bmw 2002.
long live the legend