Run flat systems.
See pictures for the 2 different beatlock systems from Hutchinson. More then 500 pieces new in stock Suitable for 10x20 inch wheels. Tire sizes: 16.00R20 14.00R20 365/85R20 (13.00R20) 395/85R20
See attachment for information. Used for 20 inch wheels. (tire size like 16.00R20, 365/80R20 etc) More then 50 pieces in stock.
Price is about 2,50 Â per kg (depends on product and tyre size)