Product Code:SAE J2523 Title:Rolling Circumference Index Groups for Radial Tractor Drivetires Issuing Committee:Atsc Tire Subcommittee Scope:This SAE Standard is established for the following purpose: a. simplify the application of radial drive wheel tires to agricultural vehicles especially those with multiple drive axle having tires of different sizes; and b. provide a pattern to combine similar sized tires into Rolling Circumference Index groups with uniform spacing between groups.