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Join Date: Dec 2005
Location: Boulder, Colorado
Posts: 1,383
Bikes: Cinelli Supercoursa 69, Ritchey Breakaway Cross, Mondonico Diamond Extra 05, Coors Light Greg Lemond (built by Scapin) 88, Scapin MTB, Stumpjumper 83, Specialized Stumpjumper M4, Lemond Poprad 2001
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The dealer where you bought the bike should repair any damage and get you a new RD from Shimano. Shimano should take care of everything the dealer does to the bike. The casting for the RD arm was definitely defective. Good luck.