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so if a GRX or Ultegra lever can push enough fluid for an RX4+ caliper then so can a Deore or SLX.
That's why I figured it should work.
The two finger Shimano levers might be a bit short on those bars, hard to tell without fitting them but when I've done similar set ups on swept back bars and the like we've tended to use something with a longer lever blade BL-MT200 are cheap AF and fine or BL-RS600 are apparently ultegra level, looks like neither have servo wave but the RS600s use i-spec if you want to attach your shifters directly to them.
snottyotter
M_V
A bit more reading last night suggests that Shimano have always used the same size piston across their entire range of calipers so if a GRX or Ultegra lever can push enough fluid for an RX4+ caliper then so can a Deore or SLX.