Sanlida Hero X10: 37" vs 40", Hero 10 III vs II

The Hero 10, usually called the Hero X10, is Sanlida's target compound bow. Here's how to choose between the lengths, versions and cam sizes.

Last updated November 11, 2026

37" or 40"?

	Hero X10 III 37"	Hero X10 III 40"
IBO speed	315 FPS	315 FPS
Let-off	75%	72%
Bare weight	4.7 lb	4.6 lb
Draw length	24"-31.5"	24.5"-32"
Brace height	7.3" / 7.5" / 7.7"	7.16" / 7.5" / 7.68"
Draw weights	30-40, 40-50, 50-60, 60-70 lb	30-40, 40-50, 50-60, 60-70 lb

A longer axle-to-axle bow is generally steadier at full draw, which is why 40" bows are popular for target shooting; a 37" bow is quicker to handle and easier to carry. Archers with longer draw lengths often prefer the 40", whose range runs to 32".

Picking a cam size

The Hero X10 uses three cam sizes. Pick the one whose range contains your draw length:

Cam	37" draw lengths	40" draw lengths
Small	24"-26.5"	24.5"-27"
Medium	26"-29"	26.5"-29.5"
Large	28.5"-31.5"	29"-32"

Hero 10 III or Hero 10 II?

The Hero 10 III is the current version, in 37" and 40". The Hero 10 II Flexible Draw Wall Edition is a 40" Hero with the same 315 FPS rating and cam ranges. It's the most-reviewed Sanlida bow on Sanlida's own store: 20 reviews, all five stars.

Build

Aerospace-grade 6061-T6 aluminium riser
BCY 452X string with BCY Halo 0.014 serving
Right-hand
More than a dozen riser colours

Hunting instead?

The Hero is a target bow. For hunting, see the Dragon series comparison.