YEA, when i put on a sportmax rear wheel my book said something like that but i found anywhere above 60+ and it caused my rear wheel to not turn freely, so i called Furber and he said that was way too tight.......
so i kinda went on wheel "feel" turning it as i torqued it down and its been good ever since... i put them on two years ago and took all my tools and checked it after a couple of rides during bike week at myrtle and again during the trip and then in the fall and again last spring before bike week again...still seems the same as when i put it on......
doug