Might be a stupid answer, but is it the little rubber hairs that exist on a new rubber tire? They look harmless enough, but I can attest, they will chew through paint and into carbon if they are hitting the chainstays.
Might be a stupid answer, but is it the little rubber hairs that exist on a new rubber tire? They look harmless enough, but I can attest, they will chew through paint and into carbon if they are hitting the chainstays.