Hi. Does anyone know if it is possible within BikeCAD to fix the frame dimensions so that when the fork length is changed the bike will pivot around its rear axle? I would like to find out how a frame whose dimensions I know with a long fork on it would be affected with by a shorter fork (i.e. what would the new head angle, bottom bracket drop, etc now be). I've tried a few different things, but every time I change the fork length the frames dimensions change to compensate. Any help would be much appreciated.