i bought a 06 1500 z71 and it has 275/65R18 wheels

[Zack Horwitz]

the stock size i think was 265/70R17
I need to buy new tires and was just wondering if i can just get the 275/65R18 tires, or if this is bad and maybe the owner messed up something by putting on the bigger wheels?

i don't know if it has a lift or anything, can't really tell.

i attached a picture if it's helpful at all.

[W8MCC]

The actual tire size (what it should be) is noted on a label inside the drivers door jam.

 

Assuming your sizes noted are correct, the difference is negligible.

 

See below:

 

 

[JimCost2014]

48 minutes ago, Zack Horwitz said:

the stock size i think was 265/70R17
I need to buy new tires and was just wondering if i can just get the 275/65R18 tires, or if this is bad and maybe the owner messed up something by putting on the bigger wheels?

i don't know if it has a lift or anything, can't really tell.

i attached a picture if it's helpful at all.

Welcome to the site.

 

You will be fine, those are just a set of factory take offs from a 2010 Silverado/Tahoe. Basically same size as the 17's. 

[Sharpz]

Those rims look good on that truck. The truck looks stock, so if I were you id just keep it as is and replace the tires per normal.  

[newdude]

You could its not that far off from stock.  If you want your speedo to be 99.9% dead on, go down to 265/65R18.  

[CamGTP]

The 265/65/18's are probably cheaper as well, if that even matters to you.

[dna9656]

The size of the stock tires the truck came with is (or should be) listed in the driver's door jam on a Max Load rating sticker.

Find a tire dealer that's a pro and trustworthy (maybe not a person in greasy, dirty coveralls with a runny nose and holes in his tennis shoes) and consult with them.

IMHE&O tire dealer's prices will be roughly within 10% of each other all over town. They make their money on the mounting, balancing and Road Hazard Protection. I'm a HUGE believer in Road Hazard protection; tires cost a lot of money!

[95_togo]

I'm no expert, but I'm pretty sure that as the ratio number (ie. 70R or 65R) gets smaller, so does the overall height of the tire. 

they make widths in several aspect ratios - a 245/45-17 will be tiny compared to a 245/70-17 (i used that size because i have the 245/45's on my OBS since it's dropped to the pavement) 

 

can't really tell if it has a leveling kit (it looks like it might though) - but it certainly doesn't have a lift - easiest way to test for level kit is to measure ground height just behind the front wheel well, and also just in front of the rear wheel well (providing all 4 tires are the same size and have similar wear) - if the numbers are the same it's leveled - if the front is lower by an inch or 3, it's stock height.