Had already asked the question in another thread, but it probably went down there. So here again: There are also these “tires with emergency running characteristics” (R66): Short description With a tire breakdown, tires with emergency running characteristics do not have to be changed immediately. A further drive is possible without great comfort losses – depending on the load up to 80 km far with a maximum speed of 80 km/h. 416,50 Euro Does anyone have experience with the parts? nd harder than normal tires, which also reduces suspension comfort (but probably doesn’t matter with ABC). Then the rolling resistance is higher, which would mean higher chipping consumption. See also herehttp://www.mercedes-benz.de/…/advantages_tyres.html