Hey all you casual cyclists beating around on those knobbly MTB tires. Stop!
How often do you hit the trail? Ever? If you generally ride on the street there is no reason to be on those chunky bumpy tires. I have no idea why so many bikes are sold ready for the trail when so few people actually ever go off road. For $10 plus cost of tires around $25-50 a pair you will find that your ride will be significantly more enjoyable.