Genuine Indy 600-20 Firestone tyre. Original development drawings were used to recreate these classic Indy Firestone tyres. This specific tire features a rounded shoulder with minimal tread, providing the correct appearance for 1930s Indy cars. These tires feature the famous Firestone Gum Dipped compound, and are only available in the 6.00-20 size, which was a standard size in 1930s race cars. Firestone Indy tires have a Blackwall sidewall, but paint markers are available, so you can paint the lettering on for the authentic look. These tires are made in the USA, and they feature a four-ply nylon construction.