Originally Posted by
Kevindale
...Yeah, I'm aware of the LeMonde formula (or I guess more correctly the Ginet formula); to me the defect in that system is that it ignores crank length, even though it's all about leg extension For me, saddle height depends on seat tube and crank length, and to a lesser extent the actual saddle (esp. if I need to adjust it forwards or back to any degree)...
The Ginet formula is based on 170mm crankarms and specifically avoids compensation for different lengths of crankarms due to reported lose of efficiency.
One parameter that very few formulas take into account is the length of the foot, which may require raising or lowering saddle depending on its proportion to leg length.