I have a wheel that is a cone drive. Don't know if that is the correct term. It has a cone that you push up and down against a rubber ring and that controls the speed.
The rubber ring has eaten itself and I need a new one but struggling to find one as it is not from a major manufacturer.
I need a 240mm diameter ring with about 20mm cross section.
Does anybody know of a similar one I could just pilfer and hack to my wheel or another ingenious solution?