Do you think it would be worthwhile spending about £300 for normal type tyres to replace the current run-flat equivalents on a BMW 3 Series Tourer in an endeavour to obtain a softer ride? We are now in our eighties and are beginning to feel the bumps, not made any easier by the current state of the roads. We are most loath to change the car. Apart from the ride, it is superb and tows a caravan almost without effort. The current tyres are 205/55R on 16-inch wheels.