Topeak MTX Rubber Shim Distanzgummi
In order for the Topeak MTX BeamRack racks can be attached to the seat post safe and stable, these small Gummi's are required. Each porter lie with them, but these are naturally subject to natural wear.
Therefore, it is worthwhile to change them at regular intervals. Also because the rubber becomes hard when not in use and loses its terminal property.
There's this for MTX BeamRack's in two different heights.
combatible: MTX BeamRack
Contents: 2 x Rubber Shim
Dimensions: Size 1 (L x W x H): 44 x 42 x 1mm
Dimensions size 2 (L x W x H): 44 x 42 x 3mm