Tire mud

As many of you have noticed my tires don’t get muddy. Is there anyone who can help me figure out how to get them muddy? They’ve already been AO baked.

@banksys_graffiti probably because they dont have an alpha channel, I have the same problem but no time/programm to fix it...

Thanks, problem solved @Mexican_420 helped me with it. He used photoshop.

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