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Offset & backspace Q

  • Thread starter Thread starter DK832
  • Start date Start date Apr 13, 2007

DK832

New Member
Apr 11, 2006
291
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0
Copenhagen, DK
Apr 13, 2007
#1
  • Apr 13, 2007
  • #1
I've seen https://www.rsracing.com/tech-wheel.html linked a couple of times and was just looking at the offset vs. backspace table they list while trying to figure out the FR500 wheels I need.

It's friday, the week was long, we were out drinking last night, BUT is the table offset 12mm or am I being stupid?
If the formula is:

Offset = Backspace - (Rim Width ÷ 2)

Wouldn't a 8" wide rim have 0 offset at 4" backspace... And not at 4.5"???
 

CraigMBA

New Member
Mar 24, 2007
783
1
0
Orange, CA
Apr 13, 2007
#2
  • Apr 13, 2007
  • #2
Depends on where the mfg stops measuring to.

Some count the lip (an 8" wide wheel is actually 9" wide from lip to lip, making a 0 offset wheel 4 1/2 backspacing).

Others don't (making the same 8" wide wheel 4" backspacing, still 0 offset).

Good luck.
 

DK832

New Member
Apr 11, 2006
291
0
0
Copenhagen, DK
Apr 13, 2007
#3
  • Apr 13, 2007
  • #3
Aha, thanks. Also just found this that explains it.
http://www.vintagewheelworks.com/tech-offset.php
I just wasn't aware the the "advertized" rim wheel width is inside the lips...
 
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