Wheel Size Question.

I have a set of centerlines with 4 7/8 bs that i use with 10 1/2" slicks, but i have to use a .350" spacer to make them work. This is on a b-body with an unknown vintage 8 3/4 under it, so it doesnt directly apply, except that 4.81 is a lot of backspace. Like blu, i like wheels with too much bs, so i can use a spacer to get them exactly where i want them.