On a stock sahara wheel can I fit 33x12.50r18?? Didn't know if the wheel is wide enough

 

You should be fine but you would need wheel spacers though.

 

Yes the wheel is wide enough. Just make sure to lower the air pressure enough to get a flat contact patch on the tires. I would do a chalk test to figure this out

 

Instructions on How to properly conduct a chalk Tire test


1
Drive to a flat area. This can be your driveway or the street in front of your house. Just make sure there aren't a lot of cracks, bumps or pot holes in the ground.

2
Draw a thick, straight line across the width of the tire.


3
Drive the car forward at least one-full car length.

4
Inspect the chalk on the ground and on the tire. A tire with the proper air pressure should press the chalk line evenly across the ground. This means you'll see the entire chalk line imprinted on the ground. An over-inflated tire will bulge and only the center of the line will touch the ground. You'll only see a small portion of line if this is the case. If you're tire is underinflated, you'll see only the sides of the lines since the middle of the tire is not making contact with the ground.

5
Adjust your tire's air pressure according to the chalk test results.



Read more: How to Chalk Tires | eHow.com How to Chalk Tires | eHow.com