Straight-pull

A spoke with a symetrical butted head. Straight pull spokes allow for more consistent spoke tension to be applied when building a wheel which makes for a stronger wheel. A straight-pull spoke hub flange also tends to be lighter than a classic J-hook interface so there are weight savings to be had. Many bicycle manufacturers opt to use straight pull spokes on bikes so they can advertise lighter and stronger wheels but that's usually where the benefits end. Most bicyce shops will stock a wide assortment of J-hook spokes since they are so common but straight-pull spokes can be much harder to come by.