I talked to a tech guy from one of the most well known tire manufacturers, that make everything from bicycle, motorcycle, to wheelbarrow tires. Not naming names due to liability. He told me many of their bicycle tires meet or exceed DOT regulations and some have speed ratings higher than motorcycles. The reason they aren't rated and regulated, is because they don't have to be. It would cost more money and time, and make their tires more expensive to the consumer. I've ridden motored bikes at speeds over 60mph with no wobbles, no blow outs, and in traffic lanes with cars. My rule of thumb is, if I'm as fast as cars, ride with them, not against them. If you're doing 30+ in a bike lane, drivers notice you as a bicycle, and turn in front of you, pull out in front of you, and inadvertantly try to kill you. How many times have any of you glanced both ways coming out of a driveway, noticed a bike or a pedestrian, and made that split second decision whether or not you can beat them? Im a cautious and courteous driver to bikes of all kinds, since I ride, but no one can judge a riders speed at a glance. All you see is a guy on a bike some distance away. I say ride safe, ride legal, and ride however you feel comfortable, whether it's in the traffic lane, or off to the side. But stay off the damn sidewalk!