I've had both. This is the low down. Duro's are good tires for the price. Bighorns are a better tire for more. That's the bottom line. Bighorns have a tougher sidewall and are less prone to splitting on hard hits. Bighorns wear better. You will get 1000 more miles out of the Bighorn's. Duro's run small, and Bighorn's run big. A 25" Duro is 25" new and fully inflated. They have a 1" tall lug and when the Lug is half wore down you are running a 24" tire at that point. Not sure about the 25" Bighorn, but the 26" Bighorn runs 26.7 inches tall when new. Bighorn's run about $30 more per tire.