Gazza, pneumatic tires were not a problem regarding faster speeds with The Blue Flame. The tires and wheels were tested at Goodyear over 850mph. They limited us to 700mph in 1970 because of our inexperience. Their speed restriction would have been removed in 1971. Actually, rubber tread pneumatic tires are ideal for running on the hard salt surface. Solid metal wheels have a very low coefficient of friction at Bonneville. Yaw control is impossible at Bonneville with those wheels. They only work on the dry lakes because they dig a furrow to steer.