What is the largest size tires I can put on a stock '99
E 150?
Thanks

 

Measure yours from the center of the hub upward to your desired height, and then times 2 so you get the diameter. Once you get the diameter you can go to any online tire shop and shop by diameter.
When you upsize it too much (all the way and barely without rubbing) your speedometer is going to be off by 15-20 mph and then you have to calibrate your speedometer afterward, if at all possible.

 

I ended up putting the stock size 235/75/15 on my stock wheels and it looks pretty good. Went with an AT tire. I will go one size bigger next time need tires. Pics to come later.

 

It wouldn't look good when you get bigger tires on 15" wheels. Change out the wheels too, 15" too small.

 

Iam planning to put 16"wheels the next go around.
Appreciate the input.