Shimano 9 MTB rear mech can be used with the old 105 10 speed road shifters?
For cassettes spacing, Shimano 9 = SRAM 9, and Shimano 10 = SRAM 10
Yes. I've used a 9 speed XT mech with a 10 speed Ultegra 6700 shifter. Worked fine.
@Brommers started
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Shimano 9 MTB rear mech can be used with the old 105 10 speed road shifters?
For cassettes spacing, Shimano 9 = SRAM 9, and Shimano 10 = SRAM 10