How To Calculate The AMO Length Of An ILF Bow

Modified from Sky Archery.

Olympic recurve bow strings are now using the AMO measuring system.  The length of the bow is determined by adding the distance between the riser bolts to the length of both limbs.  Most Olympic recurve risers are sold in 21″, 23″, 25″ or 27″ increments.  When you buy the riser, you’ll know the size, but in case you don’t you can probably go with 25″ which is the most popular size.  Of course, if you can’t get the riser length, getting the right string will be difficult.

  • Bolt Pattern is the length between Limb Bolts.
  • The Bolt Pattern is 5″ shorter than the Riser.
  • ILF Limb lengths are: Short 23″, Medium 24″, and Long 25″.

Example:

  • 25″ Riser = 20″ Bolt Pattern
  • Long Limbs = 2 x 25″ = 50″
  • 20″ + 50″ = 70″ Bow
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One thought on “How To Calculate The AMO Length Of An ILF Bow

  1. Pingback: About Brace Height | archery parent

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