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post #1 of (permalink) Old 03-25-2004, 12:06 PM Thread Starter
 
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Idiot question.... How does backspacing work?

OK OK.... I know what backspacing is, but I'm not sure I understand how it's measured.... My reason is this: I'm currently running sammi axles with 2inch backspaced wheels. I'm moving on to Toyota axles and just got my rims in the mail. They're 15x8 with 3.75" backspacing. So is this more or less backspacing? I would think the higher the number the more backspacing you have. But it doesn't look that way when I opened up one of the rims last night. Is it the other way around...better yet will these rims work fine at 3.75" BS with the toy axles and 33x12.5" tires?


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post #2 of (permalink) Old 03-25-2004, 01:27 PM
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Re: Idiot question.... How does backspacing work?

I don't have the picture that was posted a long time ago.
You may be able to find it with the search, but.
Back spacing is the distance from the face (on the rim) that goes up against you drum/hub assy to the out side of your rim (ring) the 2" back spacing will stick out farther then the 3.75" will (on the same axles). Make sure you check all the rims, they can make a mistake and give you a mixed set. I had two with 2" and two with 2.5". They said they only have 2.5" and up [img]images/graemlins/smirk.gif[/img]
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post #3 of (permalink) Old 03-25-2004, 01:38 PM
 
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Re: Idiot question.... How does backspacing work?

Backspacing is the distance from the mounting surface of the wheel to the back lip of the rim.

The smaller the number, the more the wheel sticks out, and the mounting surface is closer to the inside lip.
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post #4 of (permalink) Old 03-25-2004, 01:46 PM
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Re: Idiot question.... How does backspacing work?

DannyL posted this a while back. Jim
Tire Info
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post #5 of (permalink) Old 03-25-2004, 02:05 PM Thread Starter
 
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Re: Idiot question.... How does backspacing work?

Thanks guys....so it looks like I may have to send these back for some with different backspacin [img]images/graemlins/frown.gif[/img]


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post #6 of (permalink) Old 03-25-2004, 02:48 PM
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Re: Idiot question.... How does backspacing work?

They should work fine. I am running the same ones with 35's on toy truck axles on the wider tracker. remeber the toy axles are wider.
backspace is the distance from the outside of the inner rim to the plate the axle mounts to. the lower the number the further out the wheel will stick form the axle.
the reason you run 2" with sami axles is to get the rims off the springs. with the toy axles it shouldn't be a problem.

I am sure someone with the toy axle will help out here.
(as long as they clear the frame and springs you are good to go unless you want them out further. (
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post #7 of (permalink) Old 03-25-2004, 02:55 PM
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Re: Idiot question.... How does backspacing work?

Measure from the inside of the rims on your exsiting axle and wheel combo. then measure your toy axle and subtract the 3 3/4"
from each side. as long as they are the same or greater distance than the current setup you are good. (The toy axles will not steer as tight as the sami ones either.)
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post #8 of (permalink) Old 03-25-2004, 06:34 PM
 
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Re: Idiot question.... How does backspacing work?

The real question is, did you inboard your spring pearches on the axle to match your frame or did U outboard your spring hangers to match the stock pearches? If you outboarded your hangers U may have a problem. If not
U should be OK but if I were going to pay for new 6 lug wheels I would send them back because I want my stance as WIDE as possible.

No fender laws down here Texas way ... yeeeeeeee hawwwwwwwww
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post #9 of (permalink) Old 03-25-2004, 06:55 PM
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Re: Idiot question.... How does backspacing work?

He hasn't done the swap yet, and there are fender laws here.
(and the terrain doesn't allways reward wide rigs..)
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post #10 of (permalink) Old 03-25-2004, 06:58 PM
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Re: Idiot question.... How does backspacing work?

http://www.pirate4x4.com/forum/showt...hreadid=116013
your wheels will be fine. read down to the stuff azrockcrwler writes. I think it is line 8
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