Good sir. Please read these two threads before asking any more questions.
http://zilvia.net/f/tech-talk/166626...1-dummies.html
http://zilvia.net/f/chat/129865-whee...s-no-post.html
Thank you.
P.s. Most wheels are designated by offset, not backspacing. Both of which are severely affected by the overall width of the rim. There is no single answer.