I won't comment on vehicle weathering (definitely not qualified!) but I'd like to reinforce what has already been said about tyre colours. They are not black at full size,just look at your car,nevermind at a smaller scale,taking a scale effect into account. On aircraft I use WEM "tyre black" which is actually a darkish grey as a basis and then weather according to time and place.
Cheers
Steve
Cheers
Steve
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