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I know some classical guitars absolutely definitely can't handle extra-hard tension strings because they can cause the bridge to break or the neck to bend, so only guitars specifically designed for extra-hard tension strings should use such strings. I understand that one of those design modifications is the inclusion of a truss rod, even though classical guitars normally do not need one.

One example of extra-hard tension strings is Daddario's EJ44LP, shown below (90.8 lbs total):

Daddario EJ44LP tension chart

But what about hard tension strings? Are they safe for your average classical guitar without a truss rod? I've checked some spec sheets, like Yamaha's C40II or CG Series, and the "strings" spec seems to be about the strings that come included with the guitar, and not the recommended tension. Other than that, there doesn't seem to be other specs related to string tension.

One example of hard tension strings is Daddarios EJ46LP, shown below (84.9 lbs total):

Daddario EJ46LP tension chart

For simplicity's sake, let's assume that the "average classical guitar without truss rod" has the specs of Yamaha's C40 - C80 series. And also assume standard tuning, and 85 lbs total tension for high tension strings. Would high tension strings be safe on a classical guitar similar to those?

For reference I'm including Daddario's EJ45LP "normal" or "medium" tension specs below (82.7 lbs total):

Daddario EJ45LP tension chart

So, how does one know if high tension strings are safe for a specific guitar? Medium tension strings are said to be safe for any classical guitar, but can the same be said about high tension strings? Which specs should one look for?

Are hard tension strings generally safe for classical guitars that don't have a truss rod?

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Yes, most properly-built classical guitars should handle standard high-tension strings without problem.

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    I'm not a fan of very short answers, but I really don't see any need to add more to this one. – leftaroundabout Jan 6 at 23:06
  • I know what you mean! I wasn't sure if hard tension was still on the normal side of things regarding properly-built guitars. It's a perfectly fine answer, since it seems that it's very common that manufacturers do not include tension ranges so all we got is experience. – Von Huffman Jan 6 at 23:23
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Yes, my Alvarez Yairi does not have a truss rod, and I've used Savarez 520J high tension strings for decades without a problem. My teacher, Irvin Kauffman, recommended these strings and played for the Pittsburgh Symphony.

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