Narrator: If you're hiking pretty much anywhere in the US, this is one sound you don't want to hear... [Audio of rattlesnake rattle.] The warning of a rattlesnake. Now, just because a rattlesnake ...

Your chain should also be the first thing you check if you hear a rattling sound while riding. It could mean the loose, excess chain is contacting your frame (this is commonly called “chain slap ...