I'm a big feller! I guess this is the best place to post my first of many questions. (btw if there is a better place then someone point it out for me.) I'm a literally the workhorse of the family. I have to pull my two boys, 5 and 19mo, in a trailer. my wife and I plan on riding in a 30 mile ride in Oct. what "rpm" should I be pumping my legs? Is there a good way to tell what is best? We try to avg 10mph. Is that helpful information? good average? thanks.