Does SRAM make an adaptor to use post mount calipers with flat mount frames and forks? August 31, 2016 13:36 No. Post mount calipers are only made to work with post mount frames and forks. Related articles Does SRAM make an adaptor to use flat mount calipers with post mount frames and forks? Can I just buy the eTap® HRD 2x11 shifters and use them with my existing brake calipers? Are 11-speed SRAM RED eTap derailleur batteries compatible with SRAM RED and Force eTap AXS derailleurs? Can I configure eTap AXS™ for a lower 1x drivetrain gearing setup? Does the Orbit fluid damper or spring clutch need any maintenance or service? Comments 0 comments Article is closed for comments.