Some bicycle spokes are coated with zinc. Others are stainless steel. I don't know how to tell if they are coated without testing them in the flame. The coated ones will sputter, pop and do weird things to bead release like Chocake said. My dad had a bunch of bicycle spokes (he has a bike shop) that he gave to me when I first started. Some were fine and some weren't. But I recommend getting 308 or 316L SS welding rods and cutting them down yourself and sanding off the burrs. 308 doesn't last as long before it starts to fatigue, but sometimes that's all the welding shops have and it works fine.
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