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Why Your Bow’s Specs Might Change After a String Upgrade

Proper axle-to-axle (ATA) length and brace height are crucial for optimal bow performance. But why might these measurements change after a string and cable replacement? Nock On’s John Dudley breaks down the common causes and how to approach spec adjustments for enhanced accuracy and a smooth shooting experience.

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The Factors Affecting Bow Specs

  • String and Cable Diameter: The thickness of string servings and the material itself can alter how your strings fit in the cam grooves, affecting ATA and brace height.
  • String Color: Surprisingly, string color matters! Brighter-colored strings tend to have more wax, making them slightly thicker than uncolored natural fiber strings.
  • Limb Bolt Adjustment: Loosening or tightening limb bolts to change draw weight also impacts ATA and brace height.
  • Your Cam System: Different cam types have variations in design that can influence specs. Ensure you reference the correct measurements for the specific cam on your bow.

Smart Tips for String Replacement

  • Reference Marks: Before removing old strings, mark your cams with a pencil or a bit of tape as a guide for installing new ones. This helps you get closer to your original settings.
  • Twist to Adjust: If your new strings slightly alter your ATA or brace height, you can twist or untwist your strings and cables to compensate for the difference.
  • Bow Setup: Ensure your bow is fully tightened (“bottomed out”) to get accurate measurements when comparing specs.
  • Apples to Apples: Consider string material and strand count when comparing sets, as these factors can introduce minor spec variations.
John Dudley holding a bowstring while discussing its characteristics, with archery equipment and instructional materials visible in the background.
Marking a bow cam for string replacement. This technique helps archers maintain proper axle-to-axle length and brace height after changing strings.

Don’t Sweat the Small Stuff (But Get the Essentials Right!)

While it’s helpful to understand why specs might change, John emphasizes that precise measurements aren’t always critical. Bonus archery 101 advice: If you’re achieving your desired draw weight and the bow shoots smoothly, minor variations shouldn’t be a major concern.

Break It In

New strings need a break-in period before they fully settle. Take some shots with your new setup before making major adjustments.