Not sure about the black ACI spokes, but the silver double butted ones on my self-build wheel have served me well (2500+ miles) on my 32 hole CXP22 rims with on-one hub.
Found the following extract at :http://www.myra-simon.com/bike/wheels.html
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And yes, spokes do break, but it's not usually as the result of an impact, typically they just break as you're rolling along. Spokes break as a result of fatigue. If your wheel is loose, then every time the wheel goes around, it flexes a tiny bit, and eventually it breaks. In fact spoke breakages are the most telling sign of wheels that don't have high enough tension. If your spokes are tight, the spoke doesn't move as the wheel turns, so they can last much longer. Thus a high-tension wheel is one that will last a long time with few spoke breakages.
Not sure about the black ACI spokes, but the silver double butted ones on my self-build wheel have served me well (2500+ miles) on my 32 hole CXP22 rims with on-one hub.
Found the following extract at :http://www.myra-simon.com/bike/wheels.html
<<<<
And yes, spokes do break, but it's not usually as the result of an impact, typically they just break as you're rolling along. Spokes break as a result of fatigue. If your wheel is loose, then every time the wheel goes around, it flexes a tiny bit, and eventually it breaks. In fact spoke breakages are the most telling sign of wheels that don't have high enough tension. If your spokes are tight, the spoke doesn't move as the wheel turns, so they can last much longer. Thus a high-tension wheel is one that will last a long time with few spoke breakages.