To provide a spring strut especially for a motorcycle which is capable of omitting the use of an arm or the use of other eccentric guide element.

A suspension device 2 is provided with two air (gas) spring elements 4a, 4b which are arranged in a coaxial manner with each other, and these spring elements substantially comprise roll bellows 6a, 6b and rolling pistons 8a, 8b, respectively. The rolling pistons 8a, 8b are fixed and connected to each other. The air spring elements 4a, 4b are arranged in a mirror- symmetric manner, and are provided with a common covering plate 10 or a common external wall 12 (bell-like support bodies 12a, 12b). Both roll bellows 6a, 6b form a common dual bellow 6.