LoL - Well umm...not really sure what to tell ya cuz I'm not sure what it is your asking. The stroke is how far the rod journal is extended from the main body of the crank. In our case its 97mm, in the case of H22's its 90mm. Knife edging doesnt increase or decrease stroke. It narrows or "knife edges" the journals on the crank so that it cuts through the oil in the pan more efficiently w/ less drag.