33” inseam at 5’9” would often mean you can ride more than one size, to be fair this is the case for many riders. By way of a comparison I also have a 33” inseam, but I’m 5’ 11 ½ “ and I ride a 56cm (that’s a Yukon below; I also have
Chinook but the same size would apply for the Euros); you can see from the first picture below that although I have seat pin showing I still have scope to raise it, at least 2cm if needbe, meaning if I was shorter
possibly the 54cm frame may have also been relevant, at least relevant enough for me to have wanted to try one, even if it was just to dismiss it as an option. You can see from the lower picture that I still have quite a relaxed position on the hoods, I’m quite long in the arm so for me a 54cm would not have been long enough.
But; you are not me, what’s right for me may not be final choice even for someone who shares my exact measurements as there are other considerations to take into account, how flexible you are, any neck or back injuries that can cause discomfort when cycling, your goals and style of riding, all play a part in influencing position and as such the size frame and set up that works for you.
There is no substitute for trying for size regardless of what bike it is you are looking to buy, doesn’t necessarily need to be the exact model, just bikes that share a similar geometry and contacts points.
Paul Smith
Touring Tips