Fixed horrible crank noise after replacing chain on SRAM GX 1x11 setup. Chain was worn out and had 1000 miles. I did not expect to have to replace the crank chain ring but could not stand the noise new chain was making on old one. Tried 3 different OEM SRAM chains and all made noise until I replaced crank chain ring. Could not find SRAM 30T so had to go aftermarket.