will 255/85/16 thornbirds fit on a 98 f-150 4x4?

 

Yes they will, but I wouldn't get Thornbirds if I were you. They don't last long on the road usually, suck in the mud, and like to wander on the road. Basically their only good attribute is that they look cool (to some anyways). Why pay all that money for a tire that doesn't perform?

 

Powerstroke is right. The Turdbirds are a terrible tire. Just about any tire would be a better choice.