That is quite a bit wider, make sure there is clearance when steering is on full lock.
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.
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
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.
245/75-16
I guess you can - 235 85 R 16 is a bit narrower and taller. but not vitally. so it would fit