The 205/70/r15 is 26.3 inches tall. The 215/65/r16 is 27 inches tall.
Never mix different size tires on different rims.
Yes, you can.
It depends on if you have the clearance and the tires don't rub the inside of the fender when turning.>Al
As long as all 4 match, the height difference between 65 and 70 should not cause a problem on most vehicles.
yes
No, clincher tires are not compatible with tubeless rims.
if you are a redneck you can do anthing you want to do
Yes. As long as the chains are compatible with the type and size of tires on your van.
No, tubeless tires are not compatible with rims designed for tubes.
205 65 r 15 are compatible .
Yes you can. The difference is minimal but handling and speedometer reading may change slightly. The manufacturer has calibrated the vehicle to the recommended size so you are better off to stick to original specs. The only reason I would make the change is if the new tires were free. Don't mix sizes on the vehicle.
Yes, they are compatible as a replacement
The recommended tire specifications for a bicycle compatible with 700c x 35 tires are 700c diameter and 35mm width.