The funny part with rubber is that is scatter lights in many directions even if it is “black” due to it’s micro pores. So you get a dull highlight on it even if it is shiny.
And another thing is that “black” rubber is just dark gray, but we are used to think of car tires as black, kind of like asfalt, we tent to think of the asfalt color as much darker than it is in reality, so when we replicate what we think we see it just looks wrong. I often see the same things happening in renderings as in drawing, people over do what they think they see and what they notice most. Here’s a typical drawing example:
Notice how the light is well captured, but the face is too big, and the nose is too long with too much focus on the tip, and the mouth is an icon compared to the drawing on the right.