arrow spine help

[freebird134]

I"m confused about how to pick spine for an arrow.

For example, my 50# longbow should be shooting 5575 according to Goldtips chart, yet I've been told to use 3555s (30" arrow). That's not what the chart says, but it's pretty much what everyone has told me.

I'm looking into getting a lighter recurve to work on my form, something 30# or 35#. When I compare arrow spine suggestions on Easton's site, it suggests the same arrow spine for my 50# longbow as it does for a 30 or 35# bow.  Both it suggests 500s at 30" with 100g tips.

Does this make sense?  Its great if I can shoot the same arrow from both bows!  But, since people didn't trust the chart with my GoldTips, I don't know what to do!  Any help?  thanks

[freebird134]

Is this in the wrong forum?  Sorry if so.

[xtrema312]

From the please read this posts - "Spine questions can be asked here, or on the PowWow...and you'll likely get more and quicker answers on the PowWow."

I think you will get a lot more input on PowWow. Be sure to include your bow make, draw length, center cut if you know it, and desired point weight if you have one.

[gonefishing600]

To answer your question first, the reason you probably need a 3555 is because your site window is cut before center which would require a weaker shaft, the closer to center it's cut the stiffer the shaft. I have a 50# Tomahawk which is cut before center, and I shoot 3555 30” with 175 gr tips. Conversly, I have a 48# A&H longbow that is cut past center, and I shoot 7595 with it.

In a perfect world, 5575 means these shaft should be used in a 55-75# bow, 3555 means these shaft should be used in a 35-55# bow, etc etc. Of course we don't live in a perfect world, and these numbers should be used as  guide lines, or as starting point. There are way to many variables to consider, like what tip weight your going to use, string and sliencers type, length of feathers, etc.

Once you get familiar on how to cross reference these numbers with the spine weight, you will ignore the manufacture's recommendation, and be better off.

1535= 600
3555= 500
5575= 400
7595= 300

Start referring to the spine weight as 300, 340, 400, 500, 600, etc. What these numbers represent is decimals of an inch, or .300,.340,.400,.500, etc. this is the distance the shaft flexes with a 2 lb pull at 26”.  So, the higher the number the weaker the shaft, the lower the number the stiffer the shaft.


This is just my opinion I could be wrong!

Hope this helps!