The archery association, Archery Manufacturers and Merchants Organization or AMO became the Archery Trade Association (ATA) in late 2002 and the AMO bow length is the standard for measuring recurves and longbows and all strings are referred to by their AMO length, not the actual string length.
All bows should display their AMO length on a label affixed to the inside of the bottom limb or engraved onto the side of the riser.
The actual length of
- a recurve string is usually 4 inches shorter than the AMO length
- a longbow string is usually 3 inches shorter than the AMO length
- for a 66 inch recurve, you need a 62 inch string.
- for a 64 inch longbow, you need a 61 inch string.