All Balls Wheel Bearings and Seals Kit 25-1081;

Wheel bearings typically fail from water and dirt contamination.
Fits:
HONDA
CR125 95-07, CR250 95-07, CR500 95-01, CRF250R 04-16, CRF450R 02-16
KTM
125SX 00-02, 250SX 00-02, 380SX 00-02, 400SX 00-02, 520SX 01-02