Flexible element; Note: IR/R42 = 6 spokes; IR/R62, IR/R82, IR/R103, IR/R132 = 8 spokes
Material: rubber
Shore: Sh A 80B
| CODE | A | B | C | SERIES |
| IR/R42 | 42,00 | 20,00 | 12,00 | 1 |
| IR/R62 | 60,00 | 28,00 | 15,00 | 1 |
| IR/R82 | 79,00 | 31,00 | 17,00 | 1 |
| IR/R103 | 100,00 | 42,00 | 21,00 | 1 |
| IR/R132 | 130,00 | 63,00 | 26,00 | 1 |