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Wheel Backspacing question

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Old Jun 9, 2004 | 08:55 AM
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Default Wheel Backspacing question

Just wondering what backspacing would work for the fronts? i needed a cheap set of wheels to mount slicks on and i found some Bullshit Cragar wheels in 15x8 which should work great with my slicks. but the offset is 4 inches. Anyone know if this will work?

Thanks in advance
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Old Jun 9, 2004 | 09:01 AM
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what the heck is backspacing? Obviously it has something to do with offset but what exactly?
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Old Jun 9, 2004 | 09:06 AM
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Default Re: (RTW DC2)

backspacing is the same thing as offset isnt it?

damn these wheels are 28lbs a piece too , lol.
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Old Jun 9, 2004 | 09:13 AM
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From: Hollywood Babylon
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never heard of the term backspacing before

28lbs?? are u getting heavy wheels for a reason? looking for off-the-line traction or something?
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Old Jun 9, 2004 | 09:20 AM
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Default Re: (RTW DC2)

nope, just looking for something cheap. im wondering if i will feel a big diff since the power im pushing?
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Old Jun 9, 2004 | 09:27 AM
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Default Re: (itr206)

these are another option and i know they will fit, but 89.99 a piece for 15x7, 15.5lbs

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Old Jun 9, 2004 | 09:31 AM
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Default Re: (itr206)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr206 &raquo;</TD></TR><TR><TD CLASS="quote">nope, just looking for something cheap. im wondering if i will feel a big diff since the power im pushing?</TD></TR></TABLE>

At 28lbs. each you can bet you will feel a difference in performance (depending on what you are using now of course)..
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Old Jun 9, 2004 | 09:36 AM
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yeah Id avoid those 28lb boulders for wheels.

those other ones look nice enough, cheap, light, but they need to be black of course
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Old Jun 9, 2004 | 09:37 AM
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Default Re: Wheel Backspacing question (itr206)

A 15x8 with 4" backspacing has an offset of zero.
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Old Jun 9, 2004 | 09:45 AM
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Default Re: Wheel Backspacing question (Reid)

Fuggit i think im taking the slicks back. I cant afford to get new wheels now too.
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Old Jun 9, 2004 | 10:04 AM
  #11  
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Default Re: (itr206)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr206 &raquo;</TD></TR><TR><TD CLASS="quote">backspacing is the same thing as offset isnt it?

</TD></TR></TABLE>

Not the same thing. I can't explain it very well, but I believe tirerack has a good explanation.
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Old Jun 9, 2004 | 11:11 AM
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From: Atlantis
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.....for cheap WIIIIDE 15x8, 15x9, 15x10, etc - try keizer.

I believe rodney got a set in 15x8.5... but I'd love to see some 15x10's on an itr.....

They're cheap too - like $100 each. And they make them for you - so you decide what offset/ backspacing you want. I was gonna get a set made up for myself and I need to clear spoon calipers.
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Old Jun 9, 2004 | 11:32 AM
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Default Re: (RTW DC2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RTW DC2 &raquo;</TD></TR><TR><TD CLASS="quote">what the heck is backspacing? Obviously it has something to do with offset but what exactly?</TD></TR></TABLE>

They are different things.

Backspacing is older terminology but most of the domestic and 4X4 guys still use it. Since the metric system is still not used ubiquitously in the USA you will still hear references to it - but it is NOT the same as offset

Backspacing is: "the distance from a wheel’s mounting flange to the farthest point inboard on the wheel. Some manufacturers measure from the mounting flange to the bead and not to the little lip around the circumference of the rim, but Weld uses the latter method. Also, make sure to measure from the exact point where the wheel will contact the car, not from any depression that may be around the lug nuts. Deeper backspacing moves the wheel and tire inboard on the car; shallower moves them outboard.




Offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. The offset can be one of three types.

Zero Offset
The hub mounting surface is even with the centerline of the wheel.

Positive
The hub mounting surface is toward the front or wheel side of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars.

Negative
The hub mounting surface is toward the back or brake side of the wheels centerline. "Deep dish" wheels are typically a negative offset.



You can calculate offset from backspacing using:

Measuring Wheel Offset
To calculate offset you'll need the following measurements:

Wheel backspace
Wheel Width
Wheel Center line (outboard flange to inboard flange measurement / 2)

Subtract:

Wheel center line from Wheel backspace to get offset. If backspace is less than the wheel centerline the offset is negative
If backspace is greater than the wheel centerline the offset is positive

Or use this chart:

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Old Jun 9, 2004 | 11:51 AM
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From: Atlantis
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found a link with pics:

https://honda-tech.com/zerothread?id=806935
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