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An idler having an axis of rotation. The idler may include a hub with a flange. A plurality of rim members are positioned along a perimeter of the flange and have generally axially facing, opposite side surfaces. At least one of the side surfaces has a first interlocking formation. A clamping plate

An idler having an axis of rotation. The idler may include a hub with a flange. A plurality of rim members are positioned along a perimeter of the flange and have generally axially facing, opposite side surfaces. At least one of the side surfaces has a first interlocking formation. A clamping plate is connected to the flange. The clamping plate has a second interlocking formation coupled with the first interlocking formation. A dampening member interposes the first and second interlocking formations.

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1. An idler having an axis of rotation, the idler comprising: a hub having a flange;a plurality of rim members positioned along a perimeter of the flange and including side surfaces, and inner surfaces at least one of the side surfaces including a first interlocking formation, and at least one of th

1. An idler having an axis of rotation, the idler comprising: a hub having a flange;a plurality of rim members positioned along a perimeter of the flange and including side surfaces, and inner surfaces at least one of the side surfaces including a first interlocking formation, and at least one of the inner surfaces including a connector element that connects to the perimeter of the flange;a clamping plate connected to the flange, the clamping plate including a second interlocking formation interlocked with the first interlocking formation; anda dampening member interposed between the first and second interlocking formations. 2. The idler as set forth in claim 1, wherein the first interlocking formation includes one of a protrusion and a recess, and the second interlocking formation includes the other of the protrusion and the recess, the protrusion being received in the recess to interlock the plurality of rim members with the flange, the protrusion and the recess each including a transition surface extending at an angle less than or equal to 65 degrees with respect to the axis of rotation of the idler, the first and second interlocking formations including a locking surface extending in a plane generally parallel to the axis of rotation. 3. The idler as set forth in claim 1, wherein the plurality of rim members is encased by the dampening member. 4. The idler as set forth in claim 1, wherein the dampening member is disposed between adjacent ones of the plurality of rim members. 5. The idler as set forth in claim 1, for use in a track-type undercarriage including a track comprising interconnected track links and bushings, the bushings being separated from each other along the track by a track pitch, each rim member including a bearing surface having a chordal length less than or equal to the track pitch. 6. The idler as set forth in claim 5, wherein the clamping plate includes a mounting portion and a wear portion, bolts received through the mounting portion and the flange connect the clamping plate to the flange, the wear portion positioned to engage the track, the mounting portion and bolts being located away from the wear portion. 7. The idler as set forth in claim 1, further comprising a rib extending axially outward from the hub, wherein the rib is disposed to support the clamping plate. 8. A rim element for an idler including an axis of rotation and a hub, the rim element comprising: a rim member including a bearing surface and side surfaces extending from the bearing surface and directed generally axially when the rim element is mounted on the perimeter of a flange of the idler, the side surfaces including an interlocking formation including at least one of a protrusion and a recess, the side surfaces also including a locking surface;a dampening member fixed to at least one of the side surfaces of the rim member, wherein the dampening member encases the rim member. 9. The rim element as set forth in claim 8, wherein the interlocking formation includes a transition surface extending at an angle to the axis of rotation of the idler. 10. The rim element as set forth in claim 9, wherein the angle of each of the transition surfaces is less than about 65 degrees. 11. The rim element as set forth in claim 8, wherein the dampening member is disposed on an end surface of the rim member. 12. The rim element as set forth in claim 8, wherein the rim member includes an inner surface facing radially inward of the idler when the rim member is mounted on the perimeter of a flange of the idler, and a first connector element on the inner surface of the rim member being adapted to engage a second connector element on the idler for cooperating to inhibit movement of the rim member about the hub, the first connector element comprising a tab projecting radially inward from the inner surface of the rim member. 13. The rim element as set forth in claim 8, wherein the interlocking formation is shaped to restrict radial and axial movement of the rim element relative to the hub when the rim element is connected to the hub. 14. An idler having an axis of rotation, the idler comprising: a hub having a flange;a plurality of rim members positioned along a perimeter of the flange, at least one of the rim members including: a side surface including a first interlocking formation; andan inner surface including a connector element for mounting the at least one rim member on the perimeter of the flange;a clamping plate connected to the flange, the clamping plate including a second interlocking formation; anda dampening member interposed between the first and second interlocking formations. 15. The idler as set forth in claim 14, wherein the rim members are encapsulated by the dampening member. 16. The idler as set forth in claim 14, wherein the connector element extends radially into the flange. 17. The idler as set forth in claim 14, wherein the first interlocking formation of the rim member interlocks with the second interlocking formation of the clamping plate.