I have a total of 100 miles in the last 9 days trying to get use to swb-p38 . i have eggbeater pedals. My pain comes after about 30 min. to the lower outside of both calf muscles. They become so fatigued that I can hardly keep going. i can figure out waht it is. I thought that maybe i am extending my foot(pointing my toes) to much. Anyone have any suggestions?