So, I have had a Trek mountain bike since 2003. Every spring I get my bike out and ride the local rails to trails 4-5 days per week. I usually ride 7-15 miles at a time. Doesn't sound like much to most, but for the past few years I've just done it to stay in shape and for leisure. Now I want to start training for a Dualthon! I've been riding longer and running before my rides. The other day I ran 2 miles, rode 11 miles then ran 1 mile....whew... I have read so many threads that talk about road bikes! I don't have a road bike! I've also read a lot of threads about people wiping out on their road bikes...ouch!! I've only done it once on my mountain bike and that was not pretty! I don't ride that fast, but I know if I train for a dualthon I am obviously going to have to ride fast! That I am okay with! But, I don't know what kind of bike to buy; I don't know anything about "clipless pedals" or special shoes or any of that! I ride in shorts a tank top and my running shoes! Am I in over my head here?!