I’m just before making the final desicion about upgrading my road bike (the only one i own).
Just have thoughts about the gruppo qualities. Is Shimano 105 good enough for someone who is not a weight wheenie ad upgrading from Sora\Tiagra?
Yes. However if you can swing Ultegra go for it.
yup.
more than good enough, it is great!
Yes I used it on a trek 2.3, it worked it great.
Is Shimano 105 good enough for someone who is not a weight wheenie ad upgrading from Sora\Tiagra?
As someone who went this route, you will love, love 105 and curse those Sora thumb shifters to hell.
I’m on 105 and I like it. Shifts great and I see no noticeable difference between that and my friends Dura Ace groupo when riding.
The 105 group is more than adequate for anyone that’s not looking to eek out seconds over the course of a season. The unspoken beauty of the entry groups (105 included) is the relative cost of replacements and upgrades. Replacing a used 105 component with a new 105/ultegra component is much less painful than replacing DA, from which it is morally reprehensible to step down in component grades.
My road bike is 105 and it works fine. It’s an upgrade for sure based on what you’re currently running.
sora to 105 is a huge difference it will be a nice upgrade.
My main trainer (road) bike has probably 12000+ miles on it, some of which are on the road, and the 105 stuff still works well.
My buddy is a cat 3 and rides 105 (with ultegra shifters). He doesn’t shift very smoothly but it has held up all season for him.
If 105 saves you enough money to make any type of aero upgrade, then you will be faster than riding ultegra without that aero upgrade.
-Physiojoe
A good friend of mine raced his first year as a Cat 2 on full 105…
I would be very surprised if you could measure any difference in speed between 105 and the more expensive groups. Definitely good enough.
No problems at all with 105 on my Super 6. The crankset on a 105 build will be FSA Gossamer or something like that, which is cheap, but the 105 parts are awesome.
I’m a dork who always rides bling, but I have a 105 bike I keep at my parents in AZ. Whenever I go I can’t believe how good 105 works. 105 is great,
I owned an allez with 105 and a Tarmac with 105. I loved them both and had no issues. The first allez was an upgrade from sora/tiagra and it was a huge difference.
I owned an allez with 105 and a Tarmac with 105. I loved them both and had no issues. The first allez was an upgrade from sora/tiagra and it was a huge difference.
I’m upgrading from the same allez you have I guess.
The bike is going to be cervelo S2 with 105.
I’ve had thoughts about upgrading only the components of the allez and probably would be the less expensive option but upgrading to a all-carbon bike looks charming. 
It seems that it’s going to be 105 and saving the rest of the $$$ buying something nice to my wife to keep her calm with this purchase
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I think people need to keep bike expenses in perspective. I am guessing the 2013 version of Shimano 105 is better than the top of the line for whatever the top bikers like Hellreigel were riding 10 years ago and cranking out sub 4’30’ bike legs.
Yes, just get it. You will like, and 105 will perform and last very well
105 is great stuff but you can prolly get an Ultegra bike in Cannondal CAAD 10 or Giant TCR/Defy for the same money. You may want to check those three bikes against the one you have in mind.
http://www.giant-bicycles.com/en-us/bikes/model/tcr.composite.1/14798/66277/
http://www.cannondale.com/2013/bikes/road/elite-road/caad10/caad10-3-ultegra-double-crankset