An air spring assembly is mounted to a shock absorber to form a strut assembly. The shock absorber includes an outer cylinder with an internal piston and piston rod mounted within the outer cylinder. The piston rod is mounted to a vehicle frame member and the outer cylinder is mounted to a vehicle wheel. The air spring assembly includes a flexible member and an air spring piston that is supported by the outer cylinder. One end of the air spring piston is crimped around the flexible member to form a sealed attachment interface between the outer cylinder and the flexible member.