I used to be able to ride a standard fit on a bike until....well...I got a little older and discovered that I had a burning hot spot near the vertebrae at the base of my neck.. It used to start at about 75 miles but eventually started at about 50 miles. I tried everything. I have syntace aerobars, I widened by handlebars which helped. I settled the problem by raising the bar to a less aerodynamic position and sliding my seat back a bit. The result is I am free from pain. I completed a 400 K brevet with little or no discomfort. good luck as that kind of pain can knock a rider out of a ride or take the fun away.