The XG-1271 cassette has an aluminum back plate that doubles as the large cog, while the XG-1251 has a steel backplate as the large cog. They both offer a nickel-chrome finish and have MINI CLUSTER technology.
The XG-1271 cassette has an aluminum back plate that doubles as the large cog, while the XG-1251 has a steel backplate as the large cog. They both offer a nickel-chrome finish and have MINI CLUSTER technology.
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