A couple of bikes that I have been interested in are equipped with the Shimano Tiagra, Sora, and 105 groups. If I never looked down to see what set I was riding with, would I know the difference? Is the difference less apparent, as in longevity of components or durability. The Trek 2200 with 105 components is up to $600US more that the 1200 with Tiagra components. Is there really that much difference? I have noted that in many publications and on this forum, I seldom see anything less than 105 discussed.....guess there must be some reason. I just don't want to make any major mistakes on my firs road purchase.
Thanks
John