My rear hub SRAM T3 cracks when pedaling, but it works, in all three gears.The bike is three years in use.What shoud be done, and how urgent is the problem? I think it's something with the rear hub because the cracking sound is slightly different after each shifting of the gears.
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A crackling sound could be a bad bearing in the hub. Does it also feel gravelly (as if you have dirt in the hub) or do you hear a grinding sound as well?
Note that a single crack when changing gears is relatively normal. If all fails, go to your local bike shop to get a real opinion (internet opinions don't count).