The flip-chip varies the bottom bracket height. In the ST position, the bottom bracket is 6mm lower than in the LT position. Running the 4060 ST / 4060 Z ST with the flip-chip in the LT setting will raise the bottom bracket and give greater ground clearance. It will also slightly steepen the angles. Running the 4060 LT / 4060 Z LT with the flip-chip in the ST position will lower the bottom bracket and result in less ground clearance. It will also slightly slacken the angles.