The six ply holds the lugs and makes you get up that steep hill. GREAT FRONT TIRES FOR TRACTORS JUST REVERSE LUGS TO INCREASE STEERING ABILITY IN MUD OR SNOW. Check out our fronts for help in steering. The item "TWO 500x15, 5.00x15,500-15 JOHN DEERE 850 R1 Bar Lug Tractor Tires 6 ply withTubes" is in sale since Monday, March 19, 2012. This item is in the category "Business & Industrial\Heavy Equipment Parts & Accs\Tractor Parts".The seller is "tuckertire" and is located in Dyersburg, Tennessee. This item can be shipped to United States, Canada.