I was blown away how fast I can load all four of our bikes. 3 500 mile family trips with zero issues. Mounted to my Thule factory rack that came on my Leer topper on my 2500 Ram. The mounts are contoured for aero-style bars, but work with the Thule rectangle bars I had. The first one installed in about 10 minutes with reading the instructions, and the last one installed in less than 5 minutes. I needed zero tools.