Convert your 4 speed wheels to 6 speed.
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21/24/28 is Unibody, precision CNC from harden steel
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use on SMC/Hubsmith/others 4 speed wheels
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11/13/17/21/24/28T
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Smooth shifting
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compatible 11 speed chain only
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Available in Black or silver color
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Price excludes installation
!! 100% Authentic from Taiwan !! 100% Assurance !!
Brompton Kitchen is H&H Authorized dealer. Buy with confidence!