aha!!! as you say yourself you think it sticks out 1-2cm, so definitely over 1cm. now if it sticks out anything over 1cm then the wheel has to be over 315mm, also the wheel does not have to stick out 5cm(5.5cm to be exact) for it to be a 350mm wheel, it only has to stick out half of that size because when making a circle larger size gets added all over and not just on one side. so 5.5cm is how much bigger the wheel has to be from the base in order for it to be a 350mm wheel, but it only needs to extend 2.75cm from the base on both sides and not 5.5 cm.