The guy at the tire shop told me my 225/60R16 was basically a 6-inch difference, and I just nodded
I heard him tell a customer her two tires were 'like 6 inches apart in size' when they were 225/60R16 and 215/65R16, and she paid $40 extra for the 'matched pair.' What's the worst tire math you've heard a shop guy say out loud?
Wait, she paid extra for tires that weren't even the same size? A 225/60 and a 215/65 are close enough you can run them together fine, the height is nearly the same, so that "6 inches" thing is total nonsense. What gets me is the "matched pair" upcharge, that's just a made up fee. Next time ask them to show you the numbers on the sidewall and how they add up, because most of these guys just say stuff to sound smart. If a shop can't explain the math without hand waving, walk out.