Rubbing on 20 inch 275-60-20 Goodyear duratrac?

[Jbg243.]

From what I know,is that my 2005 Silverado Crew Cab's stock height has not been altered with. So why is it that I'm rubbing now that I installed 20 inch rims wrapped in 275-60-20 Firestone A/T tires?

[quise2024]

Firestone or duratrac?

 

I have same size duras and the rubbed the mudflap a little at full lock. Rubbed HORRIBLY LOUD in reverse full lock.

 

It was the corner so i trimmed it and all is good now.

 

 

Before

 

 

 

 

After