Yet another Wheel backspacing question

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Mar 26, 2008 | 05:10 AM

#11

Rubicon Rando

JK Enthusiast

Joined: Mar 2008

Posts: 268

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From: Schomberg Ont

i am running 35 x 12.50 on a 15 x 10 rim (- 45mm offset) no rubbing lock to lock. rubs the flenders a little at full flex.

Mar 26, 2008 | 11:54 AM

#12

steelblueJK

JK Newbie

Joined: May 2007

Posts: 47

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From: Germany

Quote:

Originally Posted by wayoflife

Factory JK Wheels have 6.25" of Back Spacing. I have physically measured them myself to verify this.

The 7.5x17" wheels (with 255/75 tires) on my german sahara have + 44.45 mm offset (1.75 "), marked in the wheels. Isn´t that 5.5" of backspacing ? Are there different wheels for export ?

Mar 26, 2008 | 01:27 PM

#13

Phishjeep

JK Super Freak

Joined: Sep 2006

Posts: 1,266

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From: Wiliamsburg, VA

8.5" wheel with +12mm offset should be 4.75 BS

Mar 26, 2008 | 02:03 PM

#14

rp41

JK Newbie

Joined: Jan 2008

Posts: 81

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From: mo

I bought a set of Pro Comp wheels with 5in BS and they rubbed at full lock. They had 13.5 wide tires. I put a set of Pro Comp 4.5 BS on another Jeep same size tire and they don't rub at all.

Mar 27, 2008 | 08:52 AM

#15

BLKRUBI

Thread Starter

JK Junkie

Joined: Feb 2007

Posts: 2,326

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From: Central Georgia

Quote:

Originally Posted by Andy25

Are we talking 4.5 " backspacing on a 8 inch rim with a 12.5inch tyre or a 9 inch rim on a 12.5 inch tyre ???? there is a difference

Actually, there's not. 4.5" of backspacing is 4.5" of backspacing. Offset changes with the wheel's width even when backspacing remains the same. Check out this chart.

You learn a lot in a year. I guess old threads never die.

Last edited by BLKRUBI; Mar 27, 2008 at 08:55 AM.

Mar 27, 2008 | 08:57 AM

#16

BLKRUBI

Thread Starter

JK Junkie

Joined: Feb 2007

Posts: 2,326

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From: Central Georgia

Quote:

Originally Posted by Phishjeep

8.5" wheel with +12mm offset should be 4.75 BS

Nope! 8.5" with a +12 is 5.25" of Backspacing. My Ultra Thunders had these specs.

Mar 28, 2008 | 12:45 PM

#17

steelblueJK

JK Newbie

Joined: May 2007

Posts: 47

Likes: 0

From: Germany

Quote:

Originally Posted by BLKRUBI

Actually, there's not. 4.5" of backspacing is 4.5" of backspacing. Offset changes with the wheel's width even when backspacing remains the same. Check out this chart.

You learn a lot in a year. I guess old threads never die.

Thank you that helps ...

But, e.g: o mm offset is 0 mm offset. Backspacing changes with the wheel's width even when offset remains the same.