If you are planning on transporting three bikes on on a trunk rack, there is no speed restrictions with the rack themselves with bikes mounted. However, you will want a bike rack that attaches securely to your vehicle. For the best fit, I recommend the Thule Passage 3 # TH911XT. The reason for the recommendation of this rack with your 2013 Infiniti FX37 is because the Passage 3 comes with a patented FitDial that ensures the proper tightness of the rack to your vehicle. The FitDial setting... view full answer...