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Question:

I bought a new treadmill and I don't know why there are so many black patches behind it

I bought a new treadmill and I don't know why there are so many black patches behind it

Answer:

As long as the belt is free of cracks, it will be ok.
There are a few small bumps that can be worn away when they are beginning to work
There may be a relationship with the rotation of the factory running, some not polished corners

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