Does SRAM make an adaptor to use flat mount calipers with post mount frames and forks? August 31, 2016 13:36 No. Flat mount calipers are only made to work with flat mount frames and forks. Related articles Does SRAM make an adaptor to use post mount calipers with flat mount frames and forks? Can I choose between 140mm and 160mm rotors for eTap® HRD 2x11 brakes? Can I just buy the eTap® HRD 2x11 shifters and use them with my existing brake calipers? What is the weight difference between RED eTap AXS™ and Force eTap AXS™? Can I digitally assign different functions to the buttons (e.g. move the derailleur outboard with a left shifter click)? Comments 0 comments Article is closed for comments.