After a long research I have finally decided to pull the trigger and buy the GT Grade Carbon 105. I was very interested in this bike from the moment I have tried the ALU version but I was afraid of the limited tire clearance. But it looks like the front can take Schwalbe G-one 40c tire. The rear clearance is more limited but I will try to put 40c there, if not, then I will have wider tire at the front and 35c in the back (combined with great rear compliance the comfort should be very good).
The last question is about the size. I have come across a great offer for 2016 model (nearly 20% discount) so I simply can't wait till march to try different sizes and I have to decide now which will be best for me. I have tried L size and it felt slightly too big (it has 565 cm TT lenght). The feeling of big comes I think from the fact that the stem on Grade is unusually long (120 cm) where other gravel bikes with 565 TT lenght uses 100 mm stem. So I think that changing the stem for a 100 mm should do the trick but I don't know how this will affect the bike handling. Grade has a long headtube which already shifts some of the weight to the back. If I additionally make the stem shorter, then the front can start to be loose and twitchy. So maybe I should go with shorter frame M size (550cm TT) to avoid that. But I have tried bikes with that short TT and I felt cramped on them.
I am 179 cm tall and my inseam is 83 cm which makes me kinda in between M and L sizes so I have to decide which will be better, especially on gravel roads where I want to spent at least 50% of my rides.
Can You help me decide what size I shoud buy?