Found some good info on this here:
http://www.titanstore.com/pdf/TireInfo.pdf
"Rim Slippage
In attempting to obtain maximum tractor drawbar pull, tube valves are occasionally torn off because of slippage of the tire bead on the rim. Tubeless tires, although immune to pulled valves due to slippage, may still suffer abrasion on the base of the bead after prolonged operation with the tire slipping on the rim. Tire slippage on the rim may be caused by:
1. Low inflation pressure for load.
2. Improper seating of tire bead on rim.
3. Use of thick soap solution or improper mounting lubricant in mounting the tire beads to the rim.
4. Inadequate tire size or strength rating for the high torque requirements.
5. Undersize rim consult Goodyear Service Department for specialized equipment needed to determine if rims are out of spec.
6. Poor rim knurling on bead seat.
When one of the first three conditions is responsible for the problem, tires should be demounted and tire
THINGS YOU SHOULD KNOW ABOUT FARM TIRESbeads and rims carefully cleaned. Tire should then be remounted and inflated to 35 psi to properly seat the tire beads on the rim. The precautions found in this handbook MUST be observed. If tube type tire, the tube should then be completely deflated and then reinflated to recommended operating pressure.
Where inadequate tire size or load capacity is the problem, a change to a higher load capacity and/or larger tire size will be required. Determine tire adequacy by checking the 鏑oad and Inflation tables.
If it is determined that the rim is undersize or has poor knurling, then it must be replaced."