Just got another email from the owner as well as one of their employees.

"Also Chris, sizing on most charts is for ROAD BIKES. Single speeds, especially track frames all have a higher bottom bracket shell of about 2cm, therefore shortening the seat tube length that most use for sizing. Most guys with normal proportioned legs that ride a 53 road, will ride a 49 to 51 ‘fixie’. You should be good."

"Hi Chris,

Yes, a traditionally measured 48cm frame would most likely be a little too small for someone of your stature, however, the Biria's measure a little differently. In this case, the 48cm is only an indication of the measurement from the center of the crank to the top of the seat tube. Since the top tube is sloping and the actual reach on the bike it more akin to a 53cm or 54, the bike rides like a larger size and KC sized you on this bike because he thought that the stand over on the 55cm (which is the only other available size in the Birias) was a little too close.

If you would like to come by and try out the 55cm to see if you think that fits you better, by all means, you should. However, since with those particular bikes there are not a wide variety of options, KC thought that the 48cm was a better fit for you.

Thanks for shopping with us! If you have any other questions, let us know. Otherwise we'll be seeing you in a month for your 30 day tune up!"