Nevermind, I'm sorry. Didn't mean to pollute the site. I found my answer. Thanks

Sorry, I'm kind of tire stupid when it comes to translations. Is the 305 equal to a 33 and the 315 to a 35? I'm looking at the Nitto Terra Grappler AT, I'm on road more than off considerably.

 

no worries... at least you put it in the right forum....

and since everyone will read this and point and laugh....

here is a tire calculator.... even with a speedo readout...

http://www.miata.net/garage/tirecalc.html