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post #1 of 16 Old 05-29-2009, 06:46 PM Thread Starter
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measurements

if a wheel measures 17x9 5x5 -6mm whats the backspacing? how do you figure it out?
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post #2 of 16 Old 05-29-2009, 06:51 PM
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Set the wheel down on its face lay a straight edge across the opening and measure to the mounting surface.


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post #3 of 16 Old 05-29-2009, 06:52 PM
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Quote:
Originally Posted by jchmelo View Post
if a wheel measures 17x9 5x5 -6mm whats the backspacing? how do you figure it out?
If I remember correctly this would be about 4.7" backspacing

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post #4 of 16 Old 05-29-2009, 06:57 PM
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here is a post I made in another thread. Just replace with your measurments

Quote:
Originally Posted by WTF_LOL View Post
Just thought of something. Wheel width is measured from the bead seats not the lip. They are generally .5" so you would have to add that to the equation.

Seems so stupid to me to have the two different formats

I also did the math wrong earlier as I did it with positive offset


First convert metric offset to inches:

-19mm / 25.4= -.748"

Add the width of the lips to the advertised width of wheel (wheel width is measured from bead seat to bead seat, we need the width from lip to lip. Usually about .5" so add an inch) then, divide by two as we need to nknwo what half the real wheel width is:

(8" + 1") / 2 = 4.5"

half wheel width + the offset that has been converted to metric

4.5" + -.748" = 3.75"
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post #5 of 16 Old 05-29-2009, 06:57 PM
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To get backspacing you take the mid point of the wheel, in your case is 4.5".
You then have "-6mm" which tells you the wheel extends out (the -). So you add 6mm to the 4.5". to convert mm to inches divide 6 by 25 which is almost .25".
4.5" + .25" = 4.75" backspacing.

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post #6 of 16 Old 05-29-2009, 07:00 PM
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yep, thats what I get also 4.763779527559055118110236220473
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post #7 of 16 Old 05-29-2009, 07:36 PM
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Wow, for measurements like that you may want to use the new
Tape that Stanley just came out with.
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post #8 of 16 Old 05-29-2009, 07:49 PM Thread Starter
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so then what is the stock bs of an 07 rubi? and will these wheels fit ?
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post #9 of 16 Old 05-29-2009, 07:54 PM
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what size of tire do you want to run?
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post #10 of 16 Old 05-29-2009, 07:56 PM Thread Starter
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stock tires so 32's isn't the stock wheel size of the 07 rubi 17x9? and so a bs of 4.53 would be good correct?
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post #11 of 16 Old 05-29-2009, 08:07 PM
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you would have plenty of clearance for 32's at 4.75" as I belive stock is right about 6". In otherwords, these will stick out 1.25" further then stock
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post #12 of 16 Old 05-30-2009, 04:53 AM Thread Starter
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ok thank you very much now i jus have to decide what ones i want thank you again!!
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post #13 of 16 Old 05-30-2009, 05:17 AM
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You gonna put a 255 width tire on a 9" wide wheel?

That's gonna look kinda funny, I'd think.


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post #14 of 16 Old 05-30-2009, 06:29 AM
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Quote:
Originally Posted by jeeperjkj View Post
You gonna put a 255 width tire on a 9" wide wheel?

That's gonna look kinda funny, I'd think.
Not sure what wheel the OP is looking at but I ran the 255's on a 17x9 wheel until I upgraded to 35's. Did not look too funny.



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post #15 of 16 Old 05-30-2009, 10:21 AM Thread Starter
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then should i think about running something like a 17x8 or what?
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post #16 of 16 Old 05-30-2009, 12:03 PM
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Quote:
Originally Posted by jchmelo View Post
then should i think about running something like a 17x8 or what?

Look at my post above and judge for yourself. Those wheels are 17x9.
I think the 255's looked good on them.

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