Understand that the spacing between chainrings is wider from road to MTB. And while you can get flat-bar shifters that work with road derailleurs, you can't get a left STI lever that will work with an MTB derailleur. And road brake levers don't pull enough cable to effectively actuate linear-pull brakes. But for the go part, if the rear axle spacing is 130 mm, I'd recommend a full Claris 8-speed kit. 8-speed freewheels are still available. But I don't have a solution for the stop part.
Last edited by oldbobcat; 08-31-22 at 10:34 PM.