After watching some cx youtube vids I got excited for the fall season and want to try it out. I decided to look through my parts bin and see if i have enough parts to build a cx. I'm thinking 1x9. What chainring should i go with if i have a 12-25t cassette? I know this might not be a favorable cassette, but like i said, parts bin. Also, what is a better option for a rear derailleur, a mountain or road one?