Don't think you'll notice any difference between the Tiagra and 105 front (especially the 2013 versions - which are on that bike).
When I was bike shopping I witnessed firsthand each component being weighed (I'm waaaaaaaaay too anal for my own good). They were within .01 ounces of each other. The same weight.
Performance wise - I don't think there is a difference.
That said, my vanity had me going with a 105 regardless.
When I was bike shopping I witnessed firsthand each component being weighed (I'm waaaaaaaaay too anal for my own good). They were within .01 ounces of each other. The same weight.
Performance wise - I don't think there is a difference.
That said, my vanity had me going with a 105 regardless.