First off I apologise as I've definitely seen this thread before but I couldn't find it via searching.
I'm not a modder myself but I enjoy editing textures, xmls etc (for personal use obviously). Recently I've edited a BFG wheel texture for the rightside wheel to counteract the mirroring bug thing; I just mirrored the sidewall graphics in the texture so they get mirrored back in-game. Everything is great except the wheel doesn't get dirty anymore when driving through the mud, something which is a fairly common error I've noticed a lot across ST/MR.
Is this something I could fix? I'm fair with paint.net and GIMP but my model knowledge doesn't really extend beyond using MeshConvert.