A LEARJET 31A WAS DISCOVERED DURING A BRAKE CHANGE TO HAVE THE MAIN WHEEL ASSEMBLIES PUT TOGETHER INCORRECTLY.

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I ASSEMBLED 4 MAIN WHEEL ASSEMBLIES FOR INSTALLATION ON A LEARJET 31A PER THE MAINT MANUAL. TIRES WERE INSTALLED ON THE ACFT ON DEC/FRI/04 WITHOUT INCIDENT BY MYSELF AND SIGNED OFF BY MY DIRECTOR OF MAINT. ON JAN/FRI/05 WHILE THE FLT CREW WAS DOING A WALKAROUND; THEY FOUND #3 BRAKE WORN TO LIMITS AND #4 BRAKE LEAKING. THE MAINT CTLR THAT REMOVED THE TIRES NOTICED THAT THE TIRES WERE OFFSET BY 1 HOLE. UPON FURTHER INSPECTION; THE CONTRACTOR FOUND ANOTHER WHEEL HALF ON THE OTHER SIDE OFFSET 1 HOLE AS WELL. ALL 4 TIRES WERE DISASSEMBLED; NON DESTRUCTIVE TESTED; AND ASSEMBLED PER MAINT MANUAL; AND INSTALLED ON THE ACFT. THIS WAS THE FIRST TIME ASSEMBLING WHEEL ASSEMBLIES FOR A LEARJET 1A. WHEN I GOT HIRED BY THE EMPLOYER JUST OVER 3 MONTHS AGO; THEY STATED THAT I WOULD BE SENT TO APPROVED ACFT SCHOOLS. I CONTRIBUTE THIS TO MY LACK OF ASKING IF EVERYTHING LOOKED OK; BUT ALSO TO THE LACK OF TRAINING AND SUPERVISION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE PROB WAS THE LOCATION OF THE INFLATION VALVE STEM AS IT RELATED TO THE BLOWOUT DISKS OR FUSE PLUGS. NO TRAINING WAS RECEIVED OR ANY HELP GIVEN ON THIS TIRE AND WHEEL ASSEMBLY JOB.