Arrow spine for a 50 lb compound at a 29 inch arrow with a 100 grain point: a 400 spine (band 400-500), plus the 250 grain minimum weight. Sourced.
Updated 05 September 2026.
What arrow spine for 50 lb draw at a 29 inch arrow
The starting spine for a 50 lb draw at a 29 inch arrow with a 100 grain point, and the weight floor.
| Draw weight | 50 lb |
|---|---|
| Arrow length | 29 in (cut, nock groove to shaft end) |
| Point weight | 100 gr |
| Recommended spine | 400 (published band 400-500) |
| Minimum total weight | 250 gr, from the 5-grains-per-pound floor |
Easton 5mm Axis carbon arrow shaft (400 spine)
Shop Easton 5mm Axis carbon arrow shaft (400 spine) on AmazonaffiliateFind Easton 5mm Axis carbon arrow shaft (400 spine) on eBayaffiliateField notes
A 50 lb bow at a 29 inch arrow moves up from the 500 a short 28 inch cut would take to a 400, because the extra inch flexes more. It is a common women's and youth-adult hunting spine.
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 50 pounds, or bare-shaft test before cutting a dozen.
Whatever spine you land on, keep the finished arrow at or above 250 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 50 lb draw at a 29 inch arrow?
For a 50 lb draw at a 29 inch arrow with a 100 grain point, start with a 400 spine (the 400-500 band), and keep the finished arrow at or above 250 grains total.