I recently purchased a Cinelli Mash CXSS frame, i will be mainly riding in the city but wanted to also take it to the trails every couple of months. My question is what would be a good build for a 80 pcnt city 20 pct trail bike. I also was thinking of building this fixed gear (with a front Canti break)

First post so take it easy i am new to building bikes but have owned a few roadies before.

What would be a good build for a 80% city / 20% trail bike?

I recently purchased a Cinelli Mash CXSS frame, I will be mainly riding in the city but wanted to also take it to the trails every couple of months. 

I also was thinking of building this up as fixed gear (with a front Canti break), so would welcome points on that too.

First post so take it easy i am new to building bikes but have owned a few roadies before.