I need front tires for my b7100 4x4 and dont know what size I need. It has 29/12.50r15 turfs on the rear and nothing on the front. I have the rims just no rubber. I was told that I need a 6-12 or a 23x8.50-12. Any thoughts??? I did find a set of 6-12 that are bar tires will that work? Thanks.