The following spine chart is for wood shafting shot from longbows.

-For recurves and high performance longbows add 5-10# bow weight.
-For selfbows, subtract 5-10# bow weight.
-For high performance recurves add 10-15# bow weight.
-For 160 grain points add 5# bow weight.
-For 190 grain points ad 10# bow weight. 

This spine chart is for reference only, the arrow that flies
the straightest is the best arrow for your bow.
Which is a good reason for offering our Tryout Pack
just select 3 sizes starting with the one suggested in the following chart
and the next two higher sizes.

Arrow Length: From string groove in nock to back of point.
Bow Wt @ Your Draw