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Old 02-19-2007, 02:58 PM   #1
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backspacing

Backspacing is driving me nuts. I understand what it is, but haven't got a clue as to how much or how little or even the purpose of the different backspace. I've read a buncha threads and still am at a loss.


If I'm looking at 15 X 8 wheels and plan on 31s with a stock suspension what backspacing fits?

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Old 02-19-2007, 03:17 PM   #2
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haven't got a clue as to how much or how little or even the purpose of the different backspace.
The less backspacong you have, the more the tires stick out, and the more backspacing you have the more they suck in


do you plan on lifting your jeep and getting wider tires later on?

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Old 02-19-2007, 03:18 PM   #3
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So, it's got nothing to do with rubbing? Any backspacing fits, just depends on local laws?
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Old 02-19-2007, 03:30 PM   #4
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So, it's got nothing to do with rubbing? Any backspacing fits, just depends on local laws?
If I remember rightly the stock wheels on a jeep are 5" backspaced. So you can use that as a guide for your purchases. I personally run 3.75" backspaced rims. Here's a decent front end shot that will show you the stance that my 35x12.50x15's have on 15x10" rims with 3.75" backspacing.

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Old 02-19-2007, 03:36 PM   #5
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So, it's got nothing to do with rubbing?
If you have too much backspacing, your tires will rub.
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Old 02-19-2007, 03:55 PM   #6
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Wheel hub depth is given in either backspacing or offset. Backspacing is the disatnce from the inner bead of the wheel to the inside of the hub on the wheel. Offset is the distance of that hub from the center of the wheel Jeepers normally use backspace as a measurement.

Jeep stock wheels run 5" to 5.5" stock backspace.

Tiny, what the proper backsapce is for is for Jeep will depend on tire diameter, tire width and lift. For example, a 31" will fit on stock space if the tire is narrow enough. At a guess, since you mention 31's I would surmise that you are looking at BFG MT km's in a 31x10.5r15. I would "guess" that these would fit with stock wheels but if you were looking for aftermarket search for something about 3.75" to 4.5". This wiil give the most variability in width selections for future and are generally the easiest to find.

If you start running oversize tires with the normal widths associated with them you would definitely need a backspacing of around 3.75" to 4" to compensate for the wider tires.

If the backspacing is too little with not enough lift (ie a 3" bs with no lift, the outside of the tires will rub on the lips of the fenders when turning).
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Old 02-19-2007, 04:22 PM   #7
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thanks guys
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Old 02-20-2007, 09:28 AM   #8
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didn't take time to read all the thread but if you have more backspacing it means the mounting point is further out to the street side so that when they go on the axle they have to go further inside the jeep (tucking under the flares) before they hit the mounting point to mount them...if they have less then it means that the wheel won't go under the jeep near as much before it hits the mounting point (which means there is more wheel sticking out on the street side)
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Old 02-20-2007, 09:49 AM   #9
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15x8 wheels with the factory backspacing of 5.5" will fit on your TJ just fine. If you have a smaller backspace number, they will stick out that much more and have less rubbing while turning, but you could run into the case of them being too far out and rubbing when offroad and stuffed into the fenders.
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Old 02-20-2007, 01:10 PM   #10
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15x8 wheels with the factory backspacing of 5.5" will fit on your TJ just fine. If you have a smaller backspace number, they will stick out that much more and have less rubbing while turning, but you could run into the case of them being too far out and rubbing when offroad and stuffed into the fenders.
Only Rubicons actually come with a true 8" wide rim. Standard TJ rims are 7.5" wide with that nasty amount of backspacing.
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Old 02-20-2007, 01:16 PM   #11
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I have spidertrax on mine anyway so I have 4.25" BS on my Canyons. :P

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