Convert your Brompton 4 speed wheels to 7 speed.
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21/24/28 is Unibody, precision CNC from harden steel
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use on Brompton P/T line stock 4 speed wheels
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11/13/15/18/21/24/28T
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Smooth shifting
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compatible 11 speed chain only
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150gm
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Available in Black color only
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Price excludes installation
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