How big is your hamster exactly?That will influence what wheel is best,not necessarily a stereotypical size for "large Syrians" which may not be appropriate for your hamster
A good example of this would be something like the Carolina Storm Express which are 10 inch wheels which suit Syrians from 4-5 inches in length,while a 12 inch wheel for example a Silent Runner would suit Syrians 4-6 inches in length instead.