I can't tell you the actual stiffness but I wrote a small .xls app that calculates actual journal overlap area (which affects stiffness). The traditional calculation [(main journal + rod journal - stroke) ÷ 2] only gives the length of the shared material.
Stock 292 2.30" main, 2.10" rod, 4.12" stroke, yes?
Stock overlap area .0725 in.2
New crank mod 2.30" main, 2.00" rod, 4.062" stroke. Area: .0561 in.2
By comparison, the stock 250 crank is .3202 in.2.
