BMW 4 Series Convertible pricing and specs BMW 4 Series Convertible pricing and specs December 18, 2020 Mid-size Bavarian cabriolet to sit $19K upstream of equivalent coupe variants BMW Australia has announced pricing and specs for its first mid-size cabriolet in almost 20 years, with the 2021 BMW 4 Series Convertible arriving in the first quarter priced from $89,900 plus on-road costs. The three-variant soft-top line-up mirrors the new BMW 4 Series Coupe that is now entering showrooms, and each attracts a $19,000 increment over the equivalent hard-roofed model. That sees the rear-wheel drive BMW 420i Convertible open proceedings at $89,900 plus ORCs, followed by the 430i Convertible at $107,900 plus ORCs and the all-wheel drive M440i xDrive Convertible topping the launch range at $135,900 plus ORCs.