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Offsets, Backspace, and other wheel info


This is a discussion on Offsets, Backspace, and other wheel info within the Tires / Wheels forums, part of the Jeep Liberty - KJ (02 to 07) category!
Register to remove these ads. It's free! Backspace to Offset Conversion Chart The table below is a quick reference for ...

Questions about wheels and tires.


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Old 09-18-2005, 05:56 PM   #1 (permalink)
 
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Default Offsets, Backspace, and other wheel info


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Backspace to Offset Conversion Chart

The table below is a quick reference for finding offset- pick the rim width and follow the row over to the backspace of your wheel.


Bolt pattern or lug pattern or bolt circle is determined by the number of bolt holes and the bolt circle diameter.

Hub Diameter or center bore is the hole at the center of the wheel.

Rear spacing or back spacing is the distance from the backside of the wheel mounting pad to the outside of the rim flange.

Offset: The distance from the centerline of the wheel to the mounting surface of the wheel.

Negative offset: When the back of the bolt pad is closer to the inside of the wheel; when mounting surface is inboard of the rim centerline.

Positive offset: When the back of the bolt pad is closer to the street side of the wheel; when the mounting surface is outboard of the rim centerline.

Bead-Loc A device which captures the tire bead between it's flanges, usually secured by bolts to keep tire bead from dismounting. Usually used in dirt circle track or off road applications where low tire pressures are used and hitting ruts or other vehicles are common. Left: An example of a Bead-Loc wheel

Info on Stock Wheels:

Bolt Pattern: 5x4.5" or 5-114mm
Backspace: 5.5" (might be a hair larger than this actually)
Offset is 41mm ( I know the chart says 38, but I found 41 from a tire vendor that said the factory wheels are 41 )
Wheel size is 16 x 7
Stock Tire Size ranges, but 235/70R16 is most common.


If anything seems wrong please correct me.

Bennett
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Old 09-18-2005, 09:32 PM   #2 (permalink)
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Cool, that chart will save me a bit of math in the future.
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Old 11-04-2005, 12:25 AM   #3 (permalink)
 
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Hey can some one explain that vhart to me up there for the backspacing? I dont really understand what all the numbers mean. I know my tire width and i have a stock '05 sport with some 245/75/16 mtr's on and at full turn the front rubs a bit on the sway bar. I was wondering how much backspacing i would need to stop this. the help would be appreciated cause a lift and new rims are in the near future! I hope! lol the wife just wrecked her car today so i dont know. thanks!
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Old 11-04-2005, 09:18 PM   #4 (permalink)
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Man that stinks. Hope no one was hurt in the crash. Maybe she'll get a kj now?
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Old 11-05-2005, 04:33 PM   #5 (permalink)
 
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Yeah she wass alright and everything. her car was pretty beat up but still fixable per All-state. so she is still keepin that but dont worry im sure we can talk her into a KJ eventually!
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Liberty or Death

2005 Sport
-2.5" Rusty's coil lift, Rusty's upper strut plate, 3/8" clevis lift
-16" Cragar softs 8s wrapped in 245/75 MTRs
and A LOT MORE STUFF!
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Old 04-05-2006, 08:04 PM   #6 (permalink)
 
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anybody know if the backspace on the stock steel rims are different to the alloys?
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Old 10-18-2006, 05:15 AM   #7 (permalink)
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Default wheel offset calculator

Here's a wheel offset calculator:
http://www.1010tires.com/WheelOffsetCalculator.asp
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Old 11-17-2006, 09:19 AM   #8 (permalink)
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Any idea what the offset is for factory 17" rims?
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Old 03-16-2007, 01:51 PM   #9 (permalink)
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I would like to make sure that I understand the Offset Conversion Chart correctly.

If my stock wheel is 16x7 with 5.5 offset = 38
The chart shows 16x8 with a 4.5 offset = 0

Does this mean that the 8" rim with 4.5 offset will be no different than my 7" rim with a 5.5 offset? The new wheel will be in the same position as my factory wheel, just an inch wider correct?

Thanks!
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Old 03-23-2007, 10:45 AM   #10 (permalink)
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Never mind. Guess this was a stupid question. I've decided to go with 16" Renegade wheels, so I'm just replacing one stock wheel for another. No calculations necessary.
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