Allows the lower of a 47mm IS headtube to be converted to use a standard 41mm 36x45 degree headset bearing.
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Tom's Pro Bike - Lancaster3687 Walden AveLancaster, NY 14086(716) 651-9995
Tom's Pro Bike - East Amherst9430 Transit RdEast Amherst, NY 14051(716) 688-2453