I had a pretty satisfying race this weekend,  I was riding really good and the altitude didn't seem to affect me too much.  In my race I was going back and forth from first to second and then on a long descent I dropped my competitor so that I had a rather satisfying lead.  then towards the end of the race with two miles to go i flatted.  I changed tubes real quick still having a large lead.  then about one minute later i flatted but this time i didn't have a spare tube so i had to run my way to the finish line, finishing in fifth place(dead last)