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Old 08-31-2006, 03:39 PM   #1
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Need help buying the correct wheels

I found a set of wheels that I like. But how do I know the correct back spacing or offset I need? What is backspacing and offset? I want to go with a 33" tire 12.5" wide. I am getting a 4inch basic suspension lift. I will either get a 15x8 or 16x8 wheel. I have a stock 2003 tj. I am pretty sure that my bolt pattern is 5 - 4 1/2. I found an american racing wheel that I like, but I need to know if the sizes they have will work for me.
The less they stick out the better.

Wheel offset backside bolt circle
16x8 0 4 1/2 5-4 1/2
15x8 -19 3 3/4 5-4 1/2

http://www.americanracing.com/wheels...y&section=ORT#[/EMAIL]
http://www.americanracing.com/wheels...y&section=ORT#

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Old 08-31-2006, 04:14 PM   #2
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get a 15x8...and backspacing is the amount of distance from where the wheel mounts (mounting pad) to the backside of the wheel (or the flange or lip) and offset can either be positive or negative or no offset...if it has negative offset then its gonna stick out past the fenders cause the mounting pad is set farther back which means more wheel sticks out...and vice versa for positive...and no offset means its set right in them iddle...and you should get 3.75" backspacing (4" at the very very most)

its hard to explain backspacing...i had someone tell me how to measure it on here (i posted a thread on it) and i had no idea what they were talkin about...but then i went outside and started lookin and studyin the wheel and it all started makin sense...he had said something about measure from the mounting pad to the flange sooo the farther in towards the outside the mounting pad is the more the other side of the wheel sticks out because theres not much wheel mounted under the fender...see, its very hard to explain...and im probably stupid anyway...but get the backspacing i said and when you get the wheel maybe you will see what i am talkin about...as i said i had to go out there and look at it and then i finally figured it out...go to http://www.discounttire.com/dtcs/infoHome.dos ...and you will find the definition of wheel offset and i think backspacing is in there somewhere too

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Old 08-31-2006, 04:17 PM   #3
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What type of units is the offset measured in? The 15x8 has a
-19 offset? Is this mm?
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Old 08-31-2006, 04:20 PM   #4
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dude that offset is perfect...i think that it equals to 3.75" backspacing...thats the offset i had when i test fit at discount tire
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Old 08-31-2006, 04:23 PM   #5
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Awesome, thanks for the information. I'm going to check out prices.
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Old 08-31-2006, 04:40 PM   #6
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Quote:
Originally Posted by bigjeep
get a 15x8...and backspacing is the amount of distance from where the wheel mounts (mounting pad) to the backside of the wheel (or the flange or lip) and offset can either be positive or negative or no offset...if it has negative offset then its gonna stick out past the fenders cause the mounting pad is set farther back which means more wheel sticks out...and vice versa for positive...and no offset means its set right in them iddle...and you should get 3.75" backspacing (4" at the very very most)

its hard to explain backspacing...i had someone tell me how to measure it on here (i posted a thread on it) and i had no idea what they were talkin about...but then i went outside and started lookin and studyin the wheel and it all started makin sense...he had said something about measure from the mounting pad to the flange sooo the farther in towards the outside the mounting pad is the more the other side of the wheel sticks out because theres not much wheel mounted under the fender...see, its very hard to explain...and im probably stupid anyway...but get the backspacing i said and when you get the wheel maybe you will see what i am talkin about...as i said i had to go out there and look at it and then i finally figured it out...go to http://www.discounttire.com/dtcs/infoHome.dos ...and you will find the definition of wheel offset and i think backspacing is in there somewhere too
Any particular reason that you wouldn't recommend the 16" wheel? On the street you would get better road manners with the shorter sidewall.
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Old 08-31-2006, 07:02 PM   #7
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well i guess you would get better flex out of the side wall too but if he wants to run a 33 then it has to be a 15" wheel unless he runs a 285 which is equivalent because when i got my tires at discount tire they said that they didn't have american sizes to fit a 16" wheel and that i would have to get metric (285)
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Old 09-01-2006, 07:39 AM   #8
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Quote:
Originally Posted by bigjeep
...but if he wants to run a 33 then it has to be a 15" wheel unless he runs a 285 which is equivalent because when i got my tires at discount tire they said that they didn't have american sizes to fit a 16" wheel and that i would have to get metric (285)


You can get 33's for 15" wheels. My old Jeep has 35'x12.50x15's on it now. The guys at those tire stores and the ones at oil change places aren't always Rhodes Scholars. There is no substitute for doing some research on your own.
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Old 09-01-2006, 07:42 AM   #9
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Quote:
Originally Posted by stainless


You can get 33's and even 35's for 15" wheels. The guys at those tire stores and the ones at oil change places aren't always Rhodes Scholars. There is no substitute for doing some research on your own.
dude i said they didn't have one to fit a 16" WHEEL ...of course they have it for 15" wheels...i have 32's mounted on 15" wheels right now! but you can't get em' mounted on 16" wheels
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Old 09-01-2006, 11:15 AM   #10
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Its done! I ordered everything it will be here next week. I bought everything except the 33 inch spare. I want to figure out how I am going to mount the spare before I get the tire. I heard some negative things about the spare adapter not being able to hold the weight.
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Old 09-01-2006, 12:50 PM   #11
coilovers are damn flexy
 
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You should not need any adapter for your spare. I have a 15X10 rim with 33X12.5 tires mounted on it. The only thing I had to do was to extend the 3 rubber tire stops on the tail gate, and raise the 3rd brake light about 1.5 inches. With the 8" rim, you should be just fine. Just make sure your tire hits the rubber stoppers, so that you don't get any wiggling on your mount.
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Old 09-01-2006, 05:57 PM   #12
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Quote:
Originally Posted by ntense77
Its done! I ordered everything it will be here next week. I bought everything except the 33 inch spare. I want to figure out how I am going to mount the spare before I get the tire. I heard some negative things about the spare adapter not being able to hold the weight.
well now you got an excuse to buy a new bumper with carrier to hold the new spare! although you wouldn't have to!

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