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Guys
I got a pair of pic related for free (probably dura ace or ultegra, 10 speed) and I'd like to use them to turn my 90's mtb into a monstercross extravanganzza.
My question is: what derailleur should I use, and what is the maximum cassette size I can use since it's a road shifter and I don't know shit about index compatibility.
Ideally I'd like to use it as a 1x10 drivetrain