I don't like the gear cables on my 9 speed 105 shifters and would love them under the bar tape but you need the 10 speed 5700 shofters for this. To save cost and not buy a new groupset would the 10 speed shifters work with my currect 9 speed rear derailiur and cassette? Thanks!
In a word, No. The gap and hence the distance the derailleur has to move between gears is different on 9 and 10 speed, and this not adjustable on the shifters, hence they are not compatible.
The 9 speed derailleur will work but not the 9 speed cassette. The derailleur does not decide the pull, that is down to the shifters, so it will work., so you would need shifters and a cassette.
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