Option parts for INFERNO MP9/MP10 series. Necessary to use together with IFW618 and IFW619 as a set. Improves the throttle feeling to change the secondary reduction ratio (43T / 13T -> 42T / 12T).
Option parts for INFERNO MP9/MP10 series. Necessary to use together with IFW618 and IFW619 as a set. Improves the throttle feeling to change the secondary reduction ratio (43T / 13T -> 42T / 12T).
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