inhibited against lateral shifting on the annular rim 46 during operation of the tractor during operation compression of the elastomeric ring 52 between the pin and bushing assemblies 26 and the outer rim 46 of wheel 12 attenuates metallic sounds and vibrations normally resulting from the impact between chain 10 and wheel 12 moreover recess 54 in the wheel rim 46 interacts with central portion 50 of ring 52 to inhibit inadvertent lateral shifting of the ring or cushion 52 during operation of the implement providing the ring 52 between the chain 22 and wheel 12 furthermore reduces impact forces of the idler 12 against the spindle 40 substantially the entire width of the outer surface of ring 52 abuts and is compressed by pin and bushing assemblies 26 lateral portions 60 and 62 and central portion 50 of ring 52 all have the same outer diameter d 3 when stretched to cover rim 46 and all engage the inner surface of pin and bushing assemblies 26 in the preferred form of the invention ring 52 is cast or molded separately from a liquid elastomeric material that is placed into a mold cavity this process provides a freestanding elastomeric ring 52 as shown in fig4 that can be later attached to wheel 12 a urethane compound which is suitable for the environmental conditions and has a durometer hardness sufficient to allow.