My MTB is making weird rattling noises in the rear. What could be wrong?

I'm in Australia and my bike has sram components.


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  • 4
    Are you sure they're authentic SRAM parts? And not knockoff ssssssssssram parts?
    – Criggie
    Mar 31 at 21:18
  • 4
    Dunno, but I'd be careful dealing with it. Those teeth can be sharp! Mar 31 at 21:38
  • 2
    Looks like your bike is somewhere in the in Americas, so if your in Australia you have a bigger problem than a slight rattle.
    – mattnz
    Apr 1 at 1:16
  • 2
    Since when did eagles eat snakes??
    – MaplePanda
    Apr 1 at 3:50
  • 3
    The teeth are not properly indexed. And you should apply some snake oil.
    – Carel
    Apr 1 at 7:17

It's not the gears that are rattling.

It's your chain!

I suspect your chain is lubricated, not by a proper thixotropic motorcycle chain lubricant, but rather by a snake oil obtained from a rattlesnake.

It isn't hard to deduce that the rattlesnake oil is causing your chain to rattle.


As a very exprienced bike mechanic i suspect its because your eagle technology cassette is not fully compatible with snake technology chain . Next time make sure every component is 100% compatible with each other before ordering them. Combining an eagle part with a snake part is expected to have compatibility issues since eagle tech is known to consume reptile tech

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