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Old 10-02-19, 03:01 PM
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RiddleOfSteel
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^^^ What he said. The shifter boss washers will have that inner raised rectangular portion facing forward--in line with the downtube. The right shift lever will mount in line with the downtube. The left shift lever is spring-loaded and will mount pointing downward, 90 from the the direction of the downtube. Once you spin the bolt on (with that D-ring for your fingers to work) and snug it, then you rotate/spin the shift lever counterclockwise almost 270 where you will feel it stop. It will not stop parallel to the downtube, but will be about 20-25 "short" of it. This is to facilitate the right hand working both levers at the same time if needed (or so the logic goes).

Of course if you received instructions with the package, they should suffice.

7900 was the last Dura-Ace era to work with the standard 1.7:1 rear derailleur cable pull ratio, which began in the mid/late '80s when they introduced their SIS/indexed shifting (minus 7400-era Dura-Ace, which played on its own team). 7700 and 7800 play ball, as do many other Shimano groupsets.
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