So I have a question about my miyata that maybe someone here can answer. My bike looks like it had very few miles on it when I bought it. The tires are miyata and I'm guessing original, strangely they are still functional. There is no noticeable wear on the chain or gears ect... so my conclusion is low miles. The rear derailer cable housing does not look stock. Its not SIS, but i'm not sure it needs to be. Did Shimano use SIS housing on down tube shifters? But beyond that its a clear coat cable housing. The brake cable housing is Grey and I think original. Does anyone know what color the rear derailer cable housing should be?