Tire Coloration Q

[Dkentaz65]

Hi Everyone, I just got these TowMaster ASC tires and noticed they have this black coloration on the side wall and not sure what's causing this or if normal. See pic posted with it circled.

[chuckster57]

I’ll let the tire experts answer, but I’m thinking if the rubber is smooth and intact you don’t need to worry about it.

[rhagfo]

Have you washed the tires? The black looks normal, the brown looks like dirt.

[bobbecky]

I’ve used this product in the past and it works great. It doesn’t harm the tire by coating it with a petroleum product and cleans the tire so it looks new. https://shop.advanceautoparts.com/p/...8&gclsrc=3p.ds

[CWtheMan]

Reference: USTMA

Clean tires with soap and water and a soft bristle brush or
a shop cloth. Treating tires with incompatible dressings or
harsh cleaning agents will hasten oxidation and result in
premature cracking. Never use petroleum-based products as
tire dressings/cleaners. Use of a pressure washer or steam
cleaner may be damaging to the tire.