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Thanks for that. However we need more information on the direction of impact. Is the front tire responsible for lifting all the dirt off the ground or something else?
– AzulShiva
Commented Dec 16, 2016 at 11:45
@mikes: And it can be minimized further if the outside of the chain is kept as free from grease as possible such as by wiping the excess of lube off after lubing the chain. (In the case of a bike with a front derailleur however a minimum of lube needs to be retained to avoid friction with the plates of said FD.)
– Carel
Commented Dec 16, 2016 at 12:55
5

Mostly kicked up from the front tyre, however not exclusively, and it can't be completely avoided. Even a bike that spends it's life sitting on an indoor trainer begins to exhibit chain black chain gunk eventually.
– Andy P
Commented Dec 16, 2016 at 13:17
1

@AzulShiva Front wheel rises dust and thows mud and water in the chain. Rear wheel can drop another dust and mud to the cain as well. If you ride through high grass, deep mudhole etc. the sticky chain collect the rubbish directly.
– Crowley
Commented Dec 16, 2016 at 18:13

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