I am about to go on my first 4 day tour next monday. i use the same bike I am touring with to commute to work each day. Problem: for whatever reason I all of a sudden am experiencing a minor saddle sore! WTF? I always use bike shorts, with nothing underneath. this is the same dam bike I have been riding forever, and normally this does not happen! What is the trick to keeping this in check? I do NOT want to have to deal with a saddle sore during a 4 day bike ride!!!!