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My two nearest Halfords only had a 50cm in stock which is way to small for my 6'3". I'm told Boardmans come up quite big so not sure whether to opt for the 55.5 or 57.5cm.
I prefer a CX bike to be a little bit smaller than a road bike. Anyone own one who could offer an opinion?
Im 6ft 1 and had a medium 55.5 - it wasn't too small for me, i ride a 57 road bike. I wanted smaller because as you i wanted to go offroad on it and it was a perfect size for that.
I'm 5'11" and ride the medium one and it comes up just right
If I were you I'd go for the LG (with the 570mm TT).
I'm on the size down from that at 5'10" and it's about right with the stem shortened a tad.