I am a competent mechanic and All my bikes are stripped to bare frame each year. Stripped in the week and parts looked at for replacements, and all cables, inner and outer are replaced as a matter of course. Cranks looked at for worn sprockets and Bottom bracket checked before removing cranks and then being removed from the frame. Headset stripped and bearings either cleaned and greased or replaced. Wheel bearings striped and the same. Saturday morning it is down to the LBS and all parts required purchased and rest of the weekend spent rebuilding it. Does help if you have all the necessary tools but these have been aquired over the last many years of riding. Only part I do not do is the wheels- I can take the odd out of true out of the rims- but they do get sent to the LBS for spoke retensioning and their trueing- which is better than mine.

So why is it that after all this stripping- cleaning- checking- replacing----- I still find parts on the shakedown ride that NOW need replacing, or are not as good as they should be.