Looking for the spine weight for these two shafts.

2117 is 81#. Can't help with the 2315, sorry I'm pretty sure it would be heavier than that, though.

Thanks I'm sure some one will chime in.

Thinking 2317 is 90# so 2315 should be under that.

Go to Easton's spine chart!

As far as deflection goes the 2117 is a .400 and the 2315 is .340...not sure if that helps...just did my first serious tuning with woodies on the weekend and one thing I learned is that comparing spine values with aluminum or carbon may be of little value...get a woodie test kit, or as in my case, a whole bunch of differently spined wood arrows and start with bareshafting being prepared to break a few before you hit the magic combination

DDave

I use these sizes often and depending on the source chosen, you sometimes find conflicting information on them. Many times I see various sources list much heavier bow weights for the 2117 and 2315 size and wonder if it is based on what I believe was the old wood arrow standard rating spine on a 26" long arrow?

However, regarding the Easton aluminums:

Checked some actual 2117 Easton Legacy arrows I have in the closet, they are marked 60-65# Longbow. Don't have any 2315 Legacies, but my 2219s say 70#-75# Longbow. Guessing that for a longbow, the 2315 would be in between at 65#-70#?

However, these numbers differ from the Easton recommendations for recurves shown below and thinking that recurves by design have a bit more initial snap, so may explain the slightly lower poundage recommendations given for them.

Checked a 2006 Easton Arrow Guide book I have. Using a 125 grain head with a 29" arrow (should you pull the standard 28" and cut them an inch longer) see 2117 recommended for 44# - 54# recurve bows with 2315 recommended for 54# - 64# recurves.

Then, using the Easton chart selector at EastonArchery.com for once again the recurve bow, 29" arrow and 125 grain head, see similar results with 2117 listed for 44# through 53# and the .340 spine (or 2315 arrow, since Easton no longer makes them in the Legacy model) listed for 59# to 63#.

Interesting to see that Easton now makes a 2217 Legacy, but a quick check didn't show spine info for it.

Not to hi-jack, Dave… But where did you get your test kit?

And Griz – does Easton make a chart that provides wood-spine equivalents?? Don’t think I’ve found that one….

2117 is not as stiff but is just a tad heavier. 2315 is a good bit stiffer so weight is close, but spine isn't.

2117 is 12 grains per inch,. 2315 is 11.8 grains per inch.

Calculated spine of these two shafts: 2117 = 77.4 lbs.; 2315 is 92.1 lbs.

On my website the is a paper on converting carbon and aluminum to wood spine and tables that have the spines calculated. The method is:

Multiply the aluminum or carbon deflection by 0.825 then divide 26" by this product to get spine.

Download the papers from the spine tester page at: www.oakcreekarchery.com

The legacys have a longbow equivalent on them. Don't know how helpful that is.

I ran my Bear TD Mag handle with 60# limbs through Stu's calculator. They are cut to 28.5 and my draw is 28. My 2117's were 81# and change, both for the bow and arrows. One of the closest matches I have ever got from calculator. Seems I like shot 2317 and 2315 from my 80# Black Widow when I was a lot younger.

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