I have two Centerlines and two welds and they are both 2.25" wide inside. I already mounted one pair and put them at 90lbs and they look perfect. Goodyear said they were designed so everyone wouldn't have to buy new wheels. I mounted them, lightly taped them on the ground all the way around , put air to them and they instantly beaded up. They have very obviously heavier casings and very little tread and a very hard compound. I asked a few crew chief if they worked good and they said they were no longer having chunks of rubber come off. Nice.