BIKE PAINS.
As with any injury pain is caused by over-use sudden increases in training volume or incorrect bike set up usually the bike is too long or the saddle either too high or too low or a combination of many factors.
NECK AND SHOULDER PAINS.
This can be caused by over stretching. You may be fine on the handlebars but then leaning further forward on the triathlon bars you completely change the way you sit and ride your bike or if your handlebars are too low.Remedy.Raise handlebars to improve flexibility core strength.Experiment with different positions can you move saddle forward to improve power position, which reduces over reaching, or do you need to shorten your handlebar stem so you have more flexion or bent elbow when riding in a relaxed fashion.
KNEE PAIN WHEN CYCLING.
The knee if injured can sometimes takes years to recover some acute injuries never improve so you should see a specialist if the problems continues.Check cleats that one has not moved and they are they both the same and facing forward.Always mark the worn out originals before replacing especially if they have cause you no problem.
LOWER BACK PAIN
Handlebars that are too low and or too far away can cause back pain. Tight hamstrings will also contribute to lower back pain.Different size legs also case pain in the lower back as your body tries to fight for balance as you cycle along.Also has your saddle been knocked and is not central?
DISCLAIMER -
The above are our general observations from the many athletes we have spoken to.Everyone is different seek individual specialist help for any problem you have.