I have the SW racks, and a 4" white PVC pipe. No interference. But the rack may differ on clearance.Question for everyone out there that have made and install tool tubes of PVC or ABS. I measured the available width interior on my left side Givi rack, and as close as I could tell using a 4" pipe would definitely interfere with the left side of the swing arm anywhere near bottoming of the suspension. Clear the tire, yes, but the swing-arm, no. How are you handling that?