A B757-200 FLT CREW WAS ADVISED BY A PAX SERVICE AGENT TO LOOK AT THE R MAIN GEAR R AFT WHEEL. CREW FOUND WHEEL AXLE HAD SEPARATED FROM GEAR TRUCK.

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WE PUSHED BACK IN ZZZ; TAXIED OUT; AND FLEW TO ZZZZ. IT WAS RAINING IN ZZZ; AND A DRY NIGHT IN ZZZZ WITH LIGHT WINDS OUT OF THE E. THE TAXI; TKOF; FLT; LNDG; AND TAXI IN WERE ALL NORMAL. A LITTLE PULLING TO ONE SIDE ON TAXI IN; BUT NOT UNUSUAL. AFTER SECURING THE ACFT AND GETTING READY TO LEAVE; OUR AGENT IN ZZZZ TOLD ME TO CHK OUT ONE OF THE WHEELS. (R TRUCK; R AFT WHEEL.) I WENT DOWN TO THE RAMP AND SAW ONE OF THE WHEELS WAS AT AN ANGLE AND LOOKED LIKE IT WAS READY TO COME OFF. I CALLED MAINT AND EXPLAINED THE SIT AND AN APPROPRIATE LOGBOOK ENTRY WAS MADE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CREW WAS READY TO LEAVE THE AIRPLANE WHEN A PAX AGENT ADVISED THEM TO LOOK AT THE R LNDG GEAR AS IT DID NOT LOOK RIGHT. UPON INSPECTING THE R LNDG GEAR; IT WAS NOTED THE R AFT WHEEL AXLE HAD SEPARATED FROM THE R LNDG GEAR TRUCK BEAM. THERE WAS NOTHING IN THE OP OF THE AIRPLANE TO INDICATE THE LNDG GEAR MALFUNCTION. RPTR STATED LNDG GEAR WAS NEARLY AT REQUIRED LNDG GEAR REPLACEMENT TIME-LIFE CYCLE.