The 255 part of the number is how wide the tire is. Bigger number more tread on the pavement. The 70 or middle number is how Tall the sidewall of the tire is. The higher the number the taller the tire. The 15 or last number listed is the rim size,again the larger number means a larger rim.
I doubt it and certainly not on the same rim. It's possible, but I would ask a tire shop pro to check it out.
I have checked Walmart .com for tire sizes 255/70/R15 and the currently do not carry this size in stock. Whether or not walmart.com carries tires depends on your zip code. In Texas, Walmart.com does not carry 255/70/15.
Yes, you can
That should be OK, but check carefully for any rubbing.
Costco.com will allow you to purchase 255/70/r15 tires online; however, you will need to visit your nearest Costco in order to pick up your order.
Yes, you can, as long as both tires on an axle are same
(The correct optional size tire would be a 245/60-15) ?
No, the 255/70-16 is too large and the diameter will be 1.10" too tall and your speedometer will be 2.2 mph too slow. You are going over 3% difference in size which is never advisable. You can use a 245/70 or a 245/60 but not a 255/70. Make sure all 4 tires are the same size on a 4wd vehicle.
That should be OK, but check carefully for any rubbing.
Can you? Yes. Should you? No. The 235 will be 3.67% smaller. This will adversely effect your ride, handling, speedometer, and braking.
My 4x4 Expedition has 265/70/17......if you have 16" wheels it should be 255/70/16
Not unless you change the aspect ratio. For instance: If you have a 215/70-15 tire and you replace it with a 255/70-15 this would be a horrible swap as the 255/70-15 would be 7.58% larger in overall diameter. It is never advisable to go over 3% difference in size. Besides your speedometer would read 55.4 at a true 60 mph. If you want to install a 255 tire you will need to install a 255/60-15 to replace a 215/70-15 which is an excellent swap.