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It has to be somewhere you put your hands to lift the bike. Check out the wheel rims. They can collect all sorts of grime when you ride in the wet. Some of it will be ground rubber from your brakes, but most is road dirt. Motor vehicles drop oil and grease, and lots of rubber on the road. If you find that is the cause, the solution is to clean them after ...


What you know right now is that there's quite a lot of it and it's quite greasy. Which is useful, but not especially useful. One thing that occurs to me is to question whether someone else might have oiled the belt for you? Has it been in a shop, or do you have someone else in your house who maintains a bike? Is there a source of fumes where you store your ...

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