blueescapes

Does anyone think that these will work without any wheel spacers? I'm looking at the Goodyear Duratrac tires. After reading the posts about them, taking all the good and bad, they seem like the right ones for me and what I need. Does anyone know if they're good in sand? Sounds like they would be. Anyway, will these tires work or will they be too big? I running the 18" stock rims. Here are the specs of the tire itself:
Sidewall: 7.5"
Radius: 6.5"
Diameter: 33.1"
Circum: 104"

My stock tires are:
Sidewall: 6.5"
Radius: 15.5"
Diameter: 15.5"
Circum: 97.6"

Thanks!