2/4 drop on 08 GMC Sierra

[piecesparts]

The 275/55/20 on my truck was right up against my liners, so the ssmaller tires were installed. My luck, was that the tires on my truck only had 500 miles on them, so the dealer gave me a good deal in the trade. I think that you will be awful close with your size choice in tires. The 285/50 tires are 31.22 inches in diameter, the 275/55 tires are 31.91 inches in diameter, and the 265/50 tires are 30.43 inches in diameter. I can see what the differences are in height, and one thing that you should consider, a slightly shorter tire will increase your low end torque.

I believe that you will end up rubbing the fender liners, but it may not be all that bad. I run my truck down the highway at normal speeds for my area, but when I hit some pavement approaches to certain bridges, I do rub my fender liners a little.