It's legal. Here's the one for my hometown.
http://www.pedalhopper.com/index_lawrence.php
There are several more around the country.
The Pedal-Party of Houston, TX
The Pedal Tavern of Milwaukee, WI
The PubCrawler of Austin, TX
The Pedal Tavern of Nashville, TN
The Pedal Hopper of Lawrence, KS...