Originally Posted by jcwitte
I just found out that the HG73 is for LX/105 and the HG93 is for Ultegra.
Is the difference in Ultegra versus LX/105 really that touchy that it would be the cause of the grinding sensation?
An HG93 will run just fine on an LX chainring. My guess would be running a new chain on worn chainrings/cassette is the cause (as above).