Final answer:
The question is regarding the maximum size of a snaffle bit ring, which is typically around 4 inches in most horse riding competitions, ensuring safety for the horse.
Step-by-step explanation:
The question about the snaffle bit ring size likely pertains to the sport of horse riding, more specifically in the context of equestrian equipment regulations. Although the exact maximum size can vary by competition, generally, the maximum inside diameter of a snaffle bit ring in most horse riding competitions is 4 inches (10.16 cm). Along with this, it should not be too thin to prevent harm to the horse's mouth, with a minimum diameter of the mouthpiece typically being about 10mm for horses and 12mm for ponies.