Arrow spine for a 80 lb compound at a 29 inch arrow with a 100 grain point: a 300 spine (band 250-300), plus the 400 grain minimum weight. Sourced.
Updated 05 September 2026.
What arrow spine for 80 lb draw at a 29 inch arrow
The starting spine for a 80 lb draw at a 29 inch arrow with a 100 grain point, and the weight floor.
| Draw weight | 80 lb |
|---|---|
| Arrow length | 29 in (cut, nock groove to shaft end) |
| Point weight | 100 gr |
| Recommended spine | 300 (published band 250-300) |
| Minimum total weight | 400 gr, from the 5-grains-per-pound floor |
Easton 5mm Axis carbon arrow shaft (300 spine)
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An 80 lb bow at a 29 inch arrow with a 100 grain point is near the top of the range; the moderate length keeps it at a stiff 300, where a 30 inch cut or 125 grain point would push it to a 250.
Spine is a starting point, not a guarantee, because a 340 from one brand can differ from another. Confirm on your arrow maker's chart at 29 inches and 80 pounds, or bare-shaft test before cutting a dozen.
Whatever spine you land on, keep the finished arrow at or above 400 grains total, the 5-grains-per-pound floor, so the bow is not shooting dangerously light.
The rules behind this pick
Questions and answers
What arrow spine for 80 lb draw at a 29 inch arrow?
For a 80 lb draw at a 29 inch arrow with a 100 grain point, start with a 300 spine (the 250-300 band), and keep the finished arrow at or above 400 grains total.