My brother and I took on the Hoyles Mill trail since we haven't ridden the whole thing. So we started off at Black Hill and was going to head to Schaeffer and back. Not sure how long it was going to be but seemed around 20 miles round trip. Well, 5 miles into the trail my brothers pedal came off. A bolt came loose inside the pedal. My brother was still able to ride with just the spindle though. So we headed back.
My brother just took the pedal apart and found the problem. Check out the precision bearings at bottom.