I would say the bikes to big for you, I'm 5' 6" with a 29" inside leg, I have a Pearson which has a horizontal top tube, its a 54cm frame and its a good fit, it still needs a short stem though, a 90. I have a Verenti Kilmeston which is a compact frame with a sloping top tube, its 53cm frame is one size too big, a 51 or 52 would have been better, I use a 75 stem on it and I'm comfortable. Looking at pictures of the Triban it looks like a compact frame with a sloping top tube, my impression of the compact frames is that they tend to be long in the top tube and they need to be a little short in the seat tube, lots of saddle post showing, to get a good fit