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PI is near about as good as it gets for an arb rope. DMc swears by Vortex, which is a tiny bit less strechy than PI. For a full on SRT ascent only line...Sterling HTP 10mm.

You perhaps need to get a bit more picky :)...maybe your trees are not tall enough for the difference between 5% stretch and 1% to strike you much, I dunno. But if you have something near to or more than 100 feet (and here it can be twice that), the difference is well worth knowing when you are...

Stiffness or limpness and static or dynamic are not the same things, brothers. You have to look at real specs to know what you're gonna get with a particular rope.

I'm of a similar mind, Stephen.

Might be so theoretically, but not so in the marketplace. Am I gonna have to pop you up side tha noggin, brother? :D

Jed, Stephen is totally correct, and if you insist, I'll fight ya about it :evil:. Warning...I'm old and wicked and I fight dirty:/:. Ask Thorman, he likely remembers my sockful of pennies :D.

I'm with Rajan...but Fi makes good points. It's easy to generalize, and not so helpful, really. Lots of improvements in the ropes we can chose from these days, and lots that are in between the OP's mentioned diameters.