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Continue to ChatSRAM Red Ergodynamic shitfter on the OPQS SL4 https://cycletechreview.com/2013/features/sram-specialized-sl4s/attachment/opqs-sram-red-ergodynamic-shifter/
SRAM Red Ergodynamic shitfter on the OPQS SL4 https://cycletechreview.com/2013/features/sram-specialized-sl4s/attachment/opqs-sram-red-ergodynamic-shifter/