I've got the same sized IROK's on my rig and they are bias ply...compound is pretty soft on them. I bought them of the classifieds here for dirt cheap so if I was buying them new i'd go with the radials since I have to drive to the trails. If it's a trail only rig that you trailer to your favorite wheelin' spots i'd say go with the bias, if you gotta drive it there and/or it's a daily driver, go with the radials to get the most mileage out of em.
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