Originally Posted by
WhyFi
And I hadn't realized that GRX wasn't just a groupset, but a line of groupsets. They have 105 and Ultegra level now?
Sure.
RX400 is 10speed = Tiagra
RX600 is 11speed = 105
RX810 is 11speed = Ultegra
RX815 is 11speed Di2 = Ultegra Di2