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Old 08-07-2014, 12:55 PM   #1
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Wheel backspacing

Ok, been a while since I dealt with this on my last jeep, but I want my tires outside my fender flares a little bit. The lower the number on the back spacing, the further out they'll sit, right? The deeper the bolt face sits inside the wheel, right?

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Old 08-07-2014, 12:56 PM   #2
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Correct brother the smaller the number is for backspacing the more the rim and tire will extend out

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Old 08-07-2014, 12:57 PM   #3
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You da man. Thanks
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Old 08-07-2014, 03:53 PM   #4
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2" spacer: What tire size would you recommend?

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Originally Posted by biggsbeeOK5292 View Post
Ok, been a while since I dealt with this on my last jeep, but I want my tires outside my fender flares a little bit. The lower the number on the back spacing, the further out they'll sit, right? The deeper the bolt face sits inside the wheel, right?
Hi,
I've got 2" spacers and am going from a 20"rim to a 15. What tire size would give me the best look without rubbing on the body of the jeep?
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Old 08-07-2014, 04:27 PM   #5
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Hi,
I've got 2" spacers and am going from a 20"rim to a 15. What tire size would give me the best look without rubbing on the body of the jeep?
Do you mean a 2 inch body lift or 2 inch spacers at the hub to push the tires out wider? If you have a 2 inch body lift you can fit 32 inch tires, but its not recommended if you are gonna flex the suspension a lot. You will rub. Most guys will stick with a 31x10.5 to play it safe
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Old 08-07-2014, 04:28 PM   #6
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You da man. Thanks
No problem brother glad I could help
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Old 08-07-2014, 05:13 PM   #7
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Spacers

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Do you mean a 2 inch body lift or 2 inch spacers at the hub to push the tires out wider? If you have a 2 inch body lift you can fit 32 inch tires, but its not recommended if you are gonna flex the suspension a lot. You will rub. Most guys will stick with a 31x10.5 to play it safe
No, not a lift. A spacer that pushes the tires out. My jeep currently sits very high with the 20" rims (will check the tire size and get back with that, sorry) but it is very high so I was wondering if 33x12.5R15 would fit in the space left over after I've reduced the rims. I bought my jeep with one busted rim so I decided to change everything instead of getting another 20" which would be quite expensive to maintain.

Oh and, I am a girl :-)
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Old 08-07-2014, 05:39 PM   #8
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Originally Posted by epdahn View Post

No, not a lift. A spacer that pushes the tires out. My jeep currently sits very high with the 20" rims (will check the tire size and get back with that, sorry) but it is very high so I was wondering if 33x12.5R15 would fit in the space left over after I've reduced the rims. I bought my jeep with one busted rim so I decided to change everything instead of getting another 20" which would be quite expensive to maintain.

Oh and, I am a girl :-)
Lol well im glad to see more girls getting into jeeps. If you have stock height suspension on a jeep tj then a 31 inch tire is the recommended size as far as height. Width is up to you since you already have those spacers. You should have no real issues rubbing even with 12.5" wide but the backspacing comes into play as well. Lower number backspacing will help keep the tires out so you won't rub.
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Old 08-07-2014, 06:52 PM   #9
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Lol well im glad to see more girls getting into jeeps. If you have stock height suspension on a jeep tj then a 31 inch tire is the recommended size as far as height. Width is up to you since you already have those spacers. You should have no real issues rubbing even with 12.5" wide but the backspacing comes into play as well. Lower number backspacing will help keep the tires out so you won't rub.
:-) Thanks for the help. Appreciated. Still VERY new to jeep (About 2 weeks). I love it but I know next to nothing about it(I don't even knw my own tire size). It a whole new language here. But I'm very interested in learning and knowing about jeeps and mine in particular.
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Old 08-08-2014, 07:20 PM   #10
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Ok so I'm back with the tire info on my Jeep. It has a 275/55R20 on it. I converted the size to inches and it came up to 31.9X10.83R20. I don't know if this is correct but if I drop my wheels to a 15" that would leave five inches of extra space where the rim used to be right? and since I already have 31" tires, adding an extra 2 inches to the tires would not make much of a difference right? Maybe I do have a lift!!! Is there a way to know this for certain by myself or do I have to take it to a garage for a mechanic to tell me?
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Old 08-08-2014, 07:39 PM   #11
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31" tall tires for 20" wheels are the same height as 31" tires on 15" wheels.
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Old 08-08-2014, 07:50 PM   #12
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31" tall tires for 20" wheels are the same height as 31" tires on 15" wheels.
Yep hes correct 31 inch is 31 inch no matter the rim size
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Old 08-08-2014, 07:57 PM   #13
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Quote:
Originally Posted by epdahn View Post
Ok so I'm back with the tire info on my Jeep. It has a 275/55R20 on it. I converted the size to inches and it came up to 31.9X10.83R20. I don't know if this is correct but if I drop my wheels to a 15" that would leave five inches of extra space where the rim used to be right? and since I already have 31" tires, adding an extra 2 inches to the tires would not make much of a difference right? Maybe I do have a lift!!! Is there a way to know this for certain by myself or do I have to take it to a garage for a mechanic to tell me?
No lift unfortunately but at least 31s can fit. And the size that you calculated is correct its almost 32 inch tall. Its up to you if you want to go bigger. If you aren't going to offroad much than you can get away with a 32. I've heard of people putting 33s on but they don't go in the woods with their jeep. 33s would be at the fenders pretty much so no room for any play
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Old 08-08-2014, 08:22 PM   #14
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epdahn: The difference in overall height between a 20" and 15" isn't in the rim, but in the sidewall height of the tire. 31" tires on 20" wheels means 5 1/2" sidewalls. 15" wheels gives an 8" sidewall. Also, going from 31" to 33" tires won't give you a 2" height change, but only 1". 1" on bottom, and 1" on the top.

As to the original backspace issue. Pushing the wheels out puts extra stress on the bearings, yes? I'd like to do the same, but have read the warnings on going to far.
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Old 08-08-2014, 08:44 PM   #15
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epdahn: The difference in overall height between a 20" and 15" isn't in the rim, but in the sidewall height of the tire. 31" tires on 20" wheels means 5 1/2" sidewalls. 15" wheels gives an 8" sidewall. Also, going from 31" to 33" tires won't give you a 2" height change, but only 1". 1" on bottom, and 1" on the top.

As to the original backspace issue. Pushing the wheels out puts extra stress on the bearings, yes? I'd like to do the same, but have read the warnings on going to far.
Yes they will put more strain in a sense especially with spacers. You are putting the leverage point out further, which can multiply the force the weight of the wheels have on the hub
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Old 08-10-2014, 06:45 AM   #16
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Boy am I glad I joined this forum! Thanks a million guys. You prevented me from making a colossal mistake. 31x10.5R15 its gonna be then. Thanks!!

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