Actually, I visited "R" the same night as "O".
Let me step back a little in case you are new to this and wondering what the heck I'm talking about.
You see ... Back in early 2015, I composed a list Denver Breweries that I had not visited (see Denver Breweries II). As I was composing the list, I realized that most of the letters in the alphabet were covered by the first letters in these brewery names.
I started with A ... A is for Alpine Dog Brewing Company
I've done things like ... B is for Baere Brewing Company; G is for Great Frontier Brewing; and L is for Little Machine Beer.
You can read every single one (including this one) at Sheppy's Blog: A to Z.
And so here we go ...
R is for Ratio Beer Works