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Old 03-25-2011, 07:11 PM   #1
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back spacing question

alright going with a rc 4 inch lift and 33's with 4.10s and super 30/35 and arbs.

What backspacing do I need to have to clear 33x12.5x15? on 15x8? is there a safe number where I know for sure it wont rub?

I'm going to drive it till the wheels fall off, put them back on, and keep going.
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Old 03-26-2011, 07:56 AM   #2
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15 x 8 with -19mm offset will give you 3.75" of backspace... Thats the same amount as a 15 x 10 with a -44mm offset. I have been looking for the answer for a while, and stumbled on it on the Black Rock website

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Old 03-26-2011, 08:32 AM   #3

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Not to disagree-just not sure- but thought I had heard 3.5" bs was what was needed. Someone has said "Cragar Soft 8's" to be honest I don't know exactly what those are except wheels-wouldn't know them if I saw them, but think a lot of people on here run them 'cause they work with the 33's and rear shock mounts. Maybe one of the tire and wheel people will chime in.
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Old 03-26-2011, 10:01 AM   #4
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I've got 33" MTZ's on DC-2's with 3.65" backspacing and still need a single washer on each steering stop to stop slight rubbing on the (anti)sway bar.
BTW that's not a typo, DC-2's have 3.65" backspacing.

Heaps of room in the rear.
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Old 03-26-2011, 10:27 AM   #5
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Obviously it depends on the ACTUAL width of the tire... Many of us run soft 8's with 4" bs and 33x12.5's with no rubbing at all... But I suppose it is due to the mfg. differences in tire width.... The largest bs you can get away with to suit your application will be your best choice to reduce wear on the hubs and stuff. But anywhere between 4.5 and 3.75 should be your sweet spot....

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Old 03-26-2011, 02:07 PM   #6
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Yea I have crager soft 8's and am going with bfg at.

Question #2 can i measure distance from front of rim back and find out my current bs. or do i need to pull the tire off to get a good measurement.

I'm going to drive it till the wheels fall off, put them back on, and keep going.
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