i am about to buy a set of 17 " TT2s and everyones says u need 4.75 backspacing for them to fit what does this mean im guessing it can be spacers because they are measured in inchs and 4and 3/4 inchs is massive.
thanks
kurtis

 

It means that there needs to be 4 3/4" space between where the lugs connect to the inside (back) of the wheel.

Backspacing is normally a function of the wheel's fabrication. However, spacers can be used to compensate.

 

oh so its basically the thickness of the center of the rim were the bolts connect to?

 

No the distance from the back to the hub. Different wheels have different "offsets". How "deep" in the wheel the hub center is.

 

so i need a positive 4.75 for my 17*8 ?

 

Backspace is measured from the back of the wheel.

Offset is measured from the center:

This page may explain better:

http://www.rsracing.com/tech-wheel.html

 

i got it now thnx for your help

 

YW