If you no any one that already does trials have some practice on there bike's maybe that will help. I ride 20" and im 6.2, I started with 26" and rode 26" for about 8 months and didnt progress much so tryed a change and now im riding 20" but it all depends on what style of riding your be doing and how you feel when riding. Post a topic seeing if there's any rider's in your area and ask if you can meet to try out there bike. Good luck mate.