Cycling tights for 40f - 60f weather?

That is a pretty big temperature range for a single garment. At the top end of the range, knee or leg warmers would be best, at the lower end, a medium weight pair of tights would work. Padded tights are expensive and unnecessary, most people wear their regular shorts under unpadded tights. I have leg warmers, knee warmers, and light, medium and heavy weight tights to deal with different temperatures, no one solution works over all cold weather temperatures.