My neck at times is still causing me issues since things flared up last spring. Since then I had my new road bike set up to the exact same measurements as my first road bike in the hope that this will avoid a reoccurrence of the neck acting up. I have yet to try out the newly adjusted bike for any length of time due to the winter weather but, the only difference between the two bikes right now is the diameter of the handle bars. Does anyone know if a smaller diameter handlebar can cause neck issues? I really don't want to go thru months of neck misery again.