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@gbj_tester
Almost certainly not. FH-7800 was the short-lived aluminium 10-speed only rotor which Shimano dumped in favour of the Ti rotor FH-7850 with normal depth splines. The connection from rotor to hubshell is completely different on the 7800 compared with 7850, 7900 and 9000. Although it's not officially supported, I'd be surprised if the 9000 rotor didn't fit the 7850 hub shell, but 7800? No way.