Aching Back

Lifeboy123 Posts: 213
edited September 2009 in Road beginners
What is the main cause of a bad back when riding long distances ? Did the GNBR on sunday which is the longest distance I have rode (60mile) was averaging 17mph after a late start stuck behind traffic but after 3 hours in the saddle my back was aching together with my right shoulder.

Is it simply a case of being new to the sport ( 150 miles to date) or are the handlebars too low ( back) and narrow ( shoulder) If so i guess I can live with the aching shoulder for now on longer runs but what should be the correct height for the front bar in relation to the saddle height which seems about right? I am 5'8 height and my bike frame size is 53.5cm