Can the forklift tires of1670,20 be replaced with military tires of 12.5-20?

It should be possible. The quality and compression resistance of military tires should be better than that of ordinary forklift tires. As long as the tire type can be successfully matched, it is not a big problem for forklift tires to be replaced by military tires.

Take 16/70,20 as an example, where16 refers to the tread width of the tire, that is to say, the tread width of this tire is 16cm, and 70 refers to the flat rate of the tire, not the tire thickness is 70cm, but the flat rate of the tire is 70% (flat rate = 20 refers to the wheel hub size)

12.5-20, where 12.5 is the nominal section width of the tire in inches. If converted into mm, it needs to be multiplied by 25.4, and 20 is the nominal rim diameter, which is a 20-inch rim. So the flat tire rate of this tire is about 63%, so it should be possible to replace this forklift tire.