Another performance upgrade was the removal of run-flat tires; the new Michelin Pilot Sport 2 tires increased grip and driver feedback and, along with revised suspension ( springs, anti-roll bars, and shock valving ), made the Viper more neutral in cornering.
32.
In Britain, Bristol produced both sleeve valved and conventional poppet valved radials : of the sleeve valved designs, more than 57, 400 Hercules engines powered the Vickers Wellington, Short Stirling, Handley Page Halifax and some versions of the Avro Lancaster, over 8, 000 of the pioneering sleeve-valved Bristol Perseus were used in various types, and more than 2, 500 of the largest-displacement production British radial from the Bristol firm to use sleeve valving, the Bristol Centaurus were used to power the Hawker Fury.
