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RX4+ Postmount Caliper MIN ? Postmount caliper designed for use with Postmount type fork and frames. For use with MINERAL Oil systems only. RX4-SH Caliper ? Designed to work with Shimano and Campagnolo dropbar brake systems (Mineral Oil, Shimano recommended for Shimano application, Campagnolo/Magura recommended for Campagnolo).