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กรุ๊ปเซ็ต Shimano 105 Di2 R7100 Rim brake 12 sp (อัพเกรดมือเบรคเป็น Ultegra R8100 12 สปีด แบบริมเบรคให้) - Saengthong Bike
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Jack Sexty: Annoyed that Shimano 105 has ditched mechanical and rim brakes? Here's why Shimano (probably) doesn't care | road.cc
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