Size Medium.  $1000.  This is the link to the original build.  https://archive.trekbikes.com/us/en/2017/Trek/stache_5#/us/en/2017/Trek/stache_5/details I'm pretty sure mine is the 18.5 but I need to double check.  I'm 5'10 for reference and it fits amazingly well.   Upgrades: XT brakes XT rear derailler Minion DHF front tire, Chupa rear. DT Swiss 350 Rear hub with 54 tooth ratchet upgrade New chain and shifter cable Newer bottom bracket (wheels manufacturi