Like most BMWs, the 4 Series comes with the option of adaptive M Sport suspension, which can be adjusted to suit different roads and driving conditions. Cars fitted with these dampers strike a fine balance between ride comfort and agility. You can choose between Sport mode, for a stiffer ride but better road holding, Comfort and Comfort +, which softens everything off for a more compliant but still well controlled ride.
On its standard passive dampers, the 4 Series is a little less able to react to changes in the road surface, so lumps and potholes are felt as heavier thumps inside the car. It's therefore best to stick with smaller alloys if you have the standard suspension. The diminutive 17in alloys might not look the best, but they’ll make the car's ride more comfortable.
Even on adaptive dampers, the optional 19in wheels still send a few thuds through your seat when travelling over rough roads.
The exotic M4, with its standard 19in alloys and bespoke tyres, has a much firmer ride than any other car in the range, but its high-quality damping means it’s never uncomfortable.