I'd like some input from people who run a 15 tooth front and 50 tooth rear sprocket set up. I rarely ride off road, I'm a dirt road explorer that has to use two lane blacktop on occasion. How much lower end grunt is lost by going to a 15 tooth front? will it do 55mph comfortably? I'm not looking for a big change, just a little on the pavement. I live in the Arkansas hills, some of them are pretty steep.