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Agree with what most others have said, 105 is great, Tiagra works exceptionally well. With trickle down technology groups lower end groups have gotten better and better.
In fact, I would go so far as to say, that 96.384% of Paceline members could use a Tiagra group on a quality aluminum frame and suffer no meaningful impact to performance/enjoyment on how we use our bikes. We have all convinced ourselves that we need a "high end" bike or need some special feature, gearing, or a bike that is 1 pound lighter for our 178 pounds. When in reality, none of that really impacts our ride. I am just as guilty of this myself, but have been doing better, with my last bike being built up with 105. After buying a top of the line S-Works Tarmac Red Etap many years ago, I realized it was a really nice bike, but not any better in any measurable way than one of their models that was almost half as expensive. /heresy
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