Last week I trashed the stock tires. I need some advice on some new ones. I have to ride 60 to 70 miles on pavement to get to the gravel and I mean gravel lots of gravel. The stock tires seemed to work well, but ARE worn out. I am more comfortable on dirt with a dualsport tire than on street with knobbies. Any suggetions on what to buy and were to order them from?