Continental tire noisy patch

[Gaurav]

My Porsche Cayenne Turbo having set of Continental tires, looks like they are in half life with the remaining tread. Recently noticed some strange noise from rear tire on slow speed, constant clack clack noise as some loose gravel stuck in the groove. On further inspection in well lit parking, just found out the area that make noise is slightly off color than other part of the tire. Is it anything wrong with this tire? There was no bulge noticed in the different color area.

[Gdanny]

This looks like a slightly swollen tire that is rubbing more ground and that's why more cleaner than dusty part. Give it a good clean and click picture of same area and see if any noticeable bulge is seen. Also you can try with pair of gloves and feel the tire as in slight bulge its difficult to notice with eyes, but its easy to feel with hand.

[Gaurav]

Thanks Gdanny, it was tire uneven wear or swollen patch whatever you call it was the culprit. Changed tires and noise is gone, what a relief.