If you need tolerances for crane wheels, is your target. If your search was for something else, double-check your source. Many older technical references or handwritten notes can lead to digit concatenation errors (e.g., "12488-1" typed as "124881").
Rapid degradation of wheel flanges and rail heads. iso 124881 pdf
Tolerances for wheel verticality, skew, and offset relative to the rail. Why It Matters If you need tolerances for crane wheels, is your target
Increased lateral forces on the building structure (crane "crabbing"). iso 124881 pdf