My son learned to cycle a year ago on a cnoc14’’. It was all going well, but I can see he’s now outgrowing it. His leg inseam measures the required minimum of 47cm for Beinn 20 and I was hoping that this way we could skip the 16 and 18 sizes and go straight for the geared bike that he would use for longer, but the bike does seem like a massive jump from the 14..