What size string for stihl fs55r trimmer weed eater?

The Stihl FS55R trimmer typically uses a string diameter of 0.095 inches (2.4 mm) for optimal performance. However, it can also accommodate strings ranging from 0.080 inches (2.0 mm) to 0.105 inches (2.7 mm). It's important to choose the right size to ensure effective cutting and prevent damage to the trimmer. Always refer to the user manual for specific recommendations.