A B737-700 ACFT TWO EACH NOSE TIRE REPLACEMENT WERE FOUND TO BE A MISMATCH OF ONE BIAS TIRE AND ONE RADIAL TIRE.

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ON THE NIGHT OF APR/THU/07; I INSTALLED 2 EACH NOSE WHEELS ON ACFT X. I FOUND OUT LATER THAT I HAD INSTALLED A MISMATCHED PAIR; ONE BIAS TIRE AND ONE RADIAL TIRE. THE PROB WAS CORRECTED -- IT WAS NOTED BY A PLT. I HAD BEEN AWARE OF THIS AS AN ISSUE AND ALSO HAD BEEN NOTIFIED BY OUR COMPANY THROUGH OUR SAFETY PROGRAM. IN ADDITION; ALTHOUGH BOTH NOSE WHEELS HAVE THE SAME PART NUMBER; THE TIRES ARE MARKED IDENTIFYING THEM AS BIAS OR NOT. I BELIEVE MY OWN COMPLACENCY WAS THE CAUSE OF THIS EVENT; I SHOULD HAVE BEEN MORE DILIGENT AND DOUBLE CHKED MY OWN WORK; EVEN ON THIS ROUTINE TASK; WHICH I DO MOST EVERY DAY. NOW AND IN THE FUTURE; I WILL DO THIS. ONE SUGGESTION TO PREVENT THIS IN THE FUTURE IS TO SEGREGATE THE WHEELS INTO SEPARATE ROWS OR AREAS; EVEN THOUGH THEY HAVE THE SAME PART NUMBERS; AS IT IS NOW THE WHEELS ARE LINED UP ON THE FLOOR; IN OUR STOCK AREA; IN ROWS AND ARE RANDOMLY MIXED TOGETHER. YOU CAN'T IDENTIFY THEM BY JUST LOOKING AT THE ROW OF WHEELS WITHOUT PHYSICALLY SEPARATING THEM.