Yes, you can but your speedometer will be 1.8 mph to fast. A much better swap would be 225/65-16.
235/60-15 or 215/65-15 are both acceptable swaps. I would go with the 215/65 as you may have clearance issues with the 235 series tire.
No, 21570R15 the 15 means that tire fits on a 15 inch rim 21565R16 the 16 means 16 inch rim.
If 235/70-16 is the OEM tire size then switching to a 245/70-16 will cause your speedometer to read 58.8 at a true 60 mph. You will also have slightly less power.
The way you have phrased your question is confusing. If you are saying that the 235/70-16 is the OEM size the answer is NO, this is not an acceptable swap. Going either way this is a bad swap. If your OEM size is 235/70-16 and you want to go to a 75 series tire then you need to install a 215/75-16. If your OEM size is 245/75-16 and you want to go to a 70 series tire then go with a 265/70-16.
Yes, you can replace a 245/75R16 tire with a 235/75R16 tire. The first number (245 or 235) represents the width of the tire in millimeters, so the 235 tire will be slightly narrower. The second number (75) represents the aspect ratio, indicating the height of the tire sidewall as a percentage of the width. The third number (16) represents the diameter of the wheel in inches, which is the same for both tires. Overall, the 235/75R16 tire will be slightly narrower but compatible with the 245/75R16 tire size.
If you have enough clearance for the wider tire, yes. You can but it is not advisable. The 245/75-16 will be 3.88% larger in overall diameter and it is never advisable to go over 3%. Your speedometer will read 57.6 at a true 60 mph. You will also have a slight loss of pulling power. You can however go to a 245/70-16 which is an excellent substitute and is only .75% larger.
a 245/70R 16 tire has a diameter of 29.5 a 225/75R 16 tire has a diameter of 29.3 which is only .2 inches larger on overall diameter. I ran a 245/70R 16 on my 02 Jeep Grand Cherokee, with only a slight problem which occurred when I turned the front wheel all the way to the right or left. I would rub the inner fender. The 02 Jeep Grand Cherokee I own used a 225/75R 16 as the factory tire size
a 245/70R 16 tire has a diameter of 29.5 a 225/75R 16 tire has a diameter of 29.3 which is only .2 inches larger on overall diameter. I ran a 245/70R 16 on my 02 Jeep Grand Cherokee, with only a slight problem which occurred when I turned the front wheel all the way to the right or left. I would rub the inner fender. The 02 Jeep Grand Cherokee I own used a 225/75R 16 as the factory tire size
The biggest stock tire I have seen is a 245/70/16
245/75-16
Absolutely not. This would be a horrible unsafe swap. The 215/60-16 tire would be 3.35" smaller in diameter which would adversely effect handling, ride, and your speedometer will read 67.6 at a true 60 mph. Your engine will also turn 90 revolutions more per mile using excess fuel. If you want to go to a 60 series tire then you must go with a 285/60-16 to equal the OEM tire. This may not be possible due to clearance issues. You can however go with a 265/65-16 which will work well.