I have a Kaitai dual sport and I love the bike however, I find myself doing a lot more road riding than off road riding and am looking for things I can do to the bike that will help road rides. I ride with another person who has a road bike and it is MUCH more efficient. I can easily ride 5mph faster on that bike with minimal effort. Would it be possible to change out the tires? Tires and rims? Something so I can more easily keep pace, without having to buy a new bicycle?