A320 FLT CREW DURING TKOF ROLL OBSERVES RUBBER TREAD DEPART ACFT.

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DURING TKOF FROM RWY 8; I SAW WHAT APPEARED TO BE A PIECE OF TIRE RUBBER BOUNCE PAST THE R SIDE OF THE AIRPLANE. WE WERE AT APPROX 130 KTS (BELOW V1). WE HAD A NORMAL TKOF WITH NO INDICATIONS OF A PROB WITH OUR AIRPLANE. I RPTED THE FOREIGN OBJECT DAMAGE TO THE TWR AND THEY SAID THEY'D CHK IT OUT. AFTER CONSULTING WITH ATC AND DISPATCH ENRTE; WE DETERMINED THAT THE RUBBER WAS PROBABLY FROM OUR AIRPLANE AND FROM A MAIN GEAR TIRE. AFTER DISCUSSING DIVERT OPTIONS; WE DECIDED TO CONTINUE. THE CAPT ADVISED THE LEAD FLT ATTENDANT OF THE SITUATION AND HAD HER PERFORM A CABIN PREPARATION. WE ASKED FOR THE FIRE TRUCKS TO BE STANDING BY UPON ARR. I GAVE THE 'BRACE' CALL OVER THE PA AT 100 FT AND A 'REMAIN SEATED' PA CALL DURING ROLLOUT. THE LNDG WAS UNEVENTFUL AND WE FELT NO VIBRATIONS; SHIMMIES; NOISES; ETC. AFTER HAVING THE FIREMEN DO A CURSORY INSPECTION OF THE TIRE; WE DECIDED IT WAS SAFE TO TAXI TO THE GATE. UPON INSPECTION WE FOUND THE TREAD FROM THE INBOARD R TIRE HAD SEPARATED. THERE WAS A DENT IN THE BOTTOM OF THE WING FROM DEBRIS IMPACT (ABOUT 6 INCHES LONG AND A COUPLE INCHES DEEP). THERE WERE SIGNS OF OTHER POTENTIAL IMPACT DAMAGE THAT THE MECHS WERE EVALUATING WHEN WE LEFT.