I am 5'8" and around 140lbs. My boy is 16hh and somewhere around 1100. Not sure since I haven't weighed him. :P But I have ridden horses that are 14.2 and I look and feel fine on them. Granted, my legs are super long so it feels a little weird (probably looks a bit funny, too), but I don't mind, and I feel that 140 is a safe weight for any horse, as long as they are fit enough to safely carry it and an appropriate height for me.