for me "go fast" and downtube shifters don't belong in the same equation. I have used Ultegra 9 speed brifters on a number of bikes over the last 10 years and have never had one malfunction. if you ride mostly on the tops of your drop bars, it is so much more efficient (for me) to be able shift and brake without moving my hands off the bars or the hoods. my drive train of choice is 9 speed, with 12-34 cassette, Ultegra outboard bearing triple crank (10 speed cranks work fine) (with a 26 granny in place of the standard 30), and Ultegra 6501 brifters. Have not tried SRAM stuff as I have sort of standardized all the bikes on the above combo. Should say most of riding is fast, smooth, mostly club rides that include a ton o climbing here in the SF east bay and environs.
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