I have 28/36/42 Biopace rings on my 1989 LHS Montana Summit. (originally 28/38/48 I changed out the middle and big rings. My "racing days" ended roughly 15 years before I was born.)
My knees and hips don't hurt as bad after riding the KHS as they do riding a bike with round rings (and comparable over-all gearing) over the same route and distance.