Bike messengers have been around almost as long as bicycles themselves. If you know anything about bike messengers these days, it is probably that they are usually linked to fixed gear bikes.
Why is this?
For bike messengers, simplicity is key. This is why fixies are so popular among the group. They are both simple to maintain (important when you are using your bike as much as a bike messenger does) and simple looking (which means they are less likely to be stolen).
If you live in a big city with bike messengers, you should stop and talk to some! You'll find that they have a passion for cycling, and they are a great source of information. Need to know which roads are the safest? The quickest route to take? Where to get your bike serviced? Ask a bike messenger!