Humm there are bike spokes and then there are bike spokes...
@ Carbon
All my first darts were made of piano wire. Tough stuff. Difficult to cut and difficult to sharpen but lasted forever or until I lost one. I had trouble finding piano wire when I moved so I switched to low carbon steel
Flag Wire and never looked back. Flag Wire is magnetic if that option is of interest and it can be "forged" (pounded) into mini broadheads with a little heat on the small anvil found at the rear of most vises. I bought mine at Home Depot.