bike question! help! its for science hw! today ppl!?

  • Thread starter Thread starter madasonblue
  • Start date Start date
i need to know wat the spikey thingy that holds the cain and goes around when u move the pedal! i need this for hw! im only 11 and i dont know it!!! 6th grade hw plz!!! help me!!!

thanx so much for those who help!
FOR JACKORY, I NEED A SPECIFIC NAME FOR IT!! I KNOE ITS GEARS!! I FOUND THAT ITS A CRANKSET BUT NOT SURE SO SHUT UP!
 
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