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STON EBCD110R2B R7100 R8100 R9200曲柄12速公路变速双盘53T 39T
STON EBCD110 R7100 R8100 R9200曲柄用8170 9270 12速双盘50T34T
STON EBCD110五爪山地公路折叠单盘椭圆片正负齿rotor force cx
STON EBCD110R2B R7100 R8100 R9200曲柄公路12速变速盘 48T 33T