Back space help please!!
It's already been covered, but this isn't hard at all.
If you use the 15x7" with a 3.5" backspace the wheel will move a 1/2" toward the quarter compared to the 15x8 with 4.5" of backspace. So, at worst you need to make sure you have an extra 1/2" to the quarter to give up with your current combination.
It probably won't be quite the full 1/2" because the tire will be more squeezed on the 7" rim vs the 8", but I wouldn't count on that being a big difference.
If you wanted to use offset, that shows you the difference. A 15x8 with a 4.5" backspace is a 0 offset wheel. A 15x7 with a 3.5" backspace is a -13 mm offset wheel. So the centerline of the wheel moved out a 12 mm (1/2"). If you wanted to keep the tire in the same place, you'd need a 15x7 with a 4" backspace ( 0 offset ).
You can also use a wheel calculator to show you this...
That only 3 countries in the world don't use the metric system and the other two are Liberia and Myanmar?
It's already been covered, but this isn't hard at all.
If you use the 15x7" with a 3.5" backspace the wheel will move a 1/2" toward the quarter compared to the 15x8 with 4.5" of backspace. So, at worst you need to make sure you have an extra 1/2" to the quarter to give up with your current combination.
It probably won't be quite the full 1/2" because the tire will be more squeezed on the 7" rim vs the 8", but I wouldn't count on that being a big difference.
If you wanted to use offset, that shows you the difference. A 15x8 with a 4.5" backspace is a 0 offset wheel. A 15x7 with a 3.5" backspace is a -13 mm offset wheel. So the centerline of the wheel moved out a 12 mm (1/2"). If you wanted to keep the tire in the same place, you'd need a 15x7 with a 4" backspace ( 0 offset ).
You can also use a wheel calculator to show you this...
That only 3 countries in the world don't use the metric system and the other two are Liberia and Myanmar?