245/70R15 tires have a diameter of 28.5", a section width of 9.6", and a wheel diameter of 15". The circumference is 89.5" and they have 708 revolutions per mile.
Generally they are approved to be mounted on 6.5-8" wide wheels for passenger tires and 6.5-7.5" for LT tires.
Specs may vary by manufacturer. learn more