A general rule is 3" less for longbows and 4" less for recurves. If my memory serves me, the grizzly is a recurve, so if amo is 62" you would need a 58" string. Just as bigcountry mentioned. Id be safe and go with a 58" string. If the brace is too shallow, no problem, twist the string up a bit. If you go with a 57" you cant grow more string if the brace is too high.