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Are road 10s 2x10 Dura Ace SL-BS79 bar-end shifters compatible with gravel GRX RX400 derailleurs 2x10?

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The GRX 400 derives from Tiagra 4700, that uses different pull ratios than other 10-speed systems from Shimano. So it's not compatible.

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  • If the SL-BS79 shifters have a friction-only mode in addition to their indexed mode, and they can provide enough total cable pull to move the GRX 400 RD through its full range, they'd work. But I can't seem to find detailed-enough specs for the SL-BS79 from Shimano's archive. Commented Jan 16, 2023 at 14:09
  • According to my experience and this topic BS79 has no friction mode: bikeforums.net/bicycle-mechanics/… Commented Jul 17, 2023 at 10:29

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