You need to give the entire number so we see where the G is.
A 'G' rating on a light truck tire means only that is a 14 ply tire. The weight capacity is dependent on the air pressure you put into the tire..
Its the weight of the tire!
265 on a tire is the width of the tire in mm
Where you hang the spare tire.
how much air is in the tire
They come on Ford Explorer but just as G. Clay says, not a brand a style
low tire pressure in one tire
it means flat tire.
the size of the tire, the model, when it was made
That is the aspect ratio , or ratio of width to height of the tire
Low tire pressure
dont you mean 3g ant it