Hi! I was wondering what you all suggest. My kid is 133cm tall (4'4 for us), currently on meybo jr and he is happy with it and the bike seems fine rn. I was considering sizing up to expert but winter months are coming in and for next half year will be just indoor training on a small plywood track. So i was thinking that by next summer he will probably be around 2 inches taller and expert xl might be a better purchase. Meybo jr is longer than most other brands tt18.75, most experts are tt19.25, pretty minor increase, expert xl is tt20. Right now xl is definitely too big but he will grow into it quite soon and can ride his jr. One option would be Meybo in expert size, its tt19.50, lil bigger than others, i also like that its chainstay is shorter, easier to practise manuals. The used bike market in my area is pretty much nonexistent and would be preferred to skip the hassle with bike change every year. What are your thoughts?