Allows the lower of a 47mm IS headtube to be converted to use a standard 41mm 36x45 degree headset bearing. Allows the lower of a 47mm IS headtube to be converted to use a standard 41mm 36x45 degree headset bearing.
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Allows the lower of a 47mm IS headtube to be converted to use a standard 41mm 36×45 degree headset bearing.
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