Subsurf modifiers are visible in the file. Usually on a render and view setting 2, that seems to be more than enough detail for distant renders. For close ups however I would recommend increasing the amount to 4.

The Blend file is easy to navigate and a help document has been provided within the zipped file, just incase its needed. 

Already grouped and ready to append into your scene.

The shader and material nodes make it very easy to change each parts colour willingly. 

This suspension model would be a real asset to any model especially a motorcycle. Please have fun with it and create something amazing.