 Rack and pinion steering was fitted , with 2 @.@ 5 turns lock to lock ; no power assistance was fitted . The Bridgestone Expedia S.01 asymmetric uni @-@ directional tyres were specially developed for the XJ220 and had to be rateable to a top speed in excess of 220 miles per hour ( 350 km / h ) , carry a doubling of load with the exceptionally high downforce at speed and maintain a compliant and comfortable ride . Rally alloy wheel specialists Speedline Corse designed the alloy wheels , these are both wider and have a larger diameter on the rear wheels ; 17 inches ( 43 cm ) wheels are fitted to the front and 18 inches ( 46 cm ) are fitted at the rear , with 255 / 55 ZR17 tyres at the front and 345 / 35 ZR18 tyres at the rear . 
