Craig,
 
 
I'm no expert on this, but here goes.
 
Backspacing: the distance from the mounting surface of the rim, to back lip of the rim.
 
Your tire, 295/50/R15.  
295: this number is how wide the tire is, in millimeters.
50: this is how tall your sidewall is, its a percentage of the first number. So on that tire, the sidewall is 50% of 295.
R15: the rim size.
 
 
Hope this helps a little bit
 
-Tim King-

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