I'm thinking about a touring built with just spare parts I have.
I have a rear Alivio M430 9 speed derailleur and Alivio 9 speed 11-34t cassette already. I want to have drops and Sora 3400 is the cheapest 9 speed road shifters I could find. I don't think there is a difference between the cog spacing between road and MTB so it should work if my assumption is true.