My peroneals have been giving me fits due to calf tightness. Where does your pain originate in regards to the peroneals? If you know the general area you can figure out what peroneal might be giving you trouble. My peroneus longus has been acting up due to tight calf muscles and the pain can be felt right below the lateral side of the knee. Other peroneus muscles can cause lateral ankle pain, behind the tibia, outer side of the foot etc.