Backspacing for 31x12.5 Boggers? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 12-01-2009, 08:53 AM   #1 (permalink)
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Backspacing for 31x12.5 Boggers?

On an impulse I just bought a set of used 31x12.5x15 Boggers. Dammit, why do people have to put junk out by the road for sale, I didn't even need tires.

I did a quick search and didn't see anything so seein that it's Tuesday...any input on what I should have for rim backspacing or spacers to get these to fit without hitting the springs? I have a 5" Calmini lift/shackle reversal setup (yeah, I know but the rig came that way) and I'm running 31x10.5 MTs on stock offset rims now that fit but rub pretty bad at full lock. Anybody else running 12.5's on their rig? How do you like them?
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Old 12-01-2009, 10:00 AM   #2 (permalink)
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well, to fit them without adding spacers,(which is never really good), I'd say take off the lift kit, sell it, and do a spring over. by getting the springs up higher over the axle rubbing will be absolutely minimized. instead of the tire getting rubbed at about midway up from the ground, it would be higher up, and therefore the tire could be turned more before contact. I had a spring over and 12.50's and had very little rubbing.
just my .02 cents
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Old 12-01-2009, 02:04 PM   #3 (permalink)
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I'm spoa with yjs, Running 31/13.50/15 tsl/sx's with no problem on 2.5 inch bs wheels
33/12.50 mtrs rubbed quite a bit. Bumpstops helped allot..
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Last edited by skipholiday; 12-01-2009 at 02:54 PM.
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Old 12-01-2009, 04:37 PM   #4 (permalink)
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the smaller the backspacing the better. If you can get a zero backspace or a 1" then go for it. You can get usually away with 2.5" on those tires and still have some comfort zone, but it depends on the tire. Like Skip was saying, he had 13.5's that didnt' rub, but 12.5's that did. What boggers are they?

SPOA is going to raise your contact point with the spring by about 3 or 4 inches. Right now its about 1-2 inchs below center line at rest. With it SPOA it will be about 1-2 inchs above centerline at rest. So your contact point will be the same if your vehicle is perfectly flat when you turn. Since it is not and your spring will be loaded, your SPOA puts your tire closer to center when it compresses VS further from center when it compresses with SPUA.

the reverse shackle spring under lift is going to give you much more on road stability and better handling than a SPOA lift but it's a much harder ride off road with less droop and the u-bolts take a real beating if you drive it hard.
Ultimately go with a SPOA reverse shackle and you'll have an awesome setup.
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Old 12-01-2009, 05:57 PM   #5 (permalink)
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Thanks guys. The tires are the Interco Swamper Boggers. I'll shop around for some 2.5" bs rims. I've been running this rig for two years and it's clear the sua lift is waaaaaay too stiff in the woods, but it is nice on the street. Yup, I have also had to replace a couple of u bolts.
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Old 12-01-2009, 06:28 PM   #6 (permalink)
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I run 31 x 12.5 swamper SSR's on my sami with a spring over, bonz eye springs and 2.5" backspacing I can turn lock to lock with out ever touching the springs. My old sami 86 had 4" backspacing and 31 x 12.5 boggers and they hit like crazy. You should be ok with the 2.5" backspaced wheels. I got mine recently from four wheel parts, they had some in stock.
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Old 12-02-2009, 05:09 PM   #7 (permalink)
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How about 31-11.50 TSL's, mounted on older jeep steel wheels?
SPOA YJ's.
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Old 12-02-2009, 05:46 PM   #8 (permalink)
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Bethel, we're practically neighbors...
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Old 12-02-2009, 06:17 PM   #9 (permalink)
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Oh yea, you near the border? I actually work in Hanover NH.
Do you happen to have a bunch of stuff on ebay now? I was looking for an extra trans and noticed one nearby in NH for 150. I ended up getting one w/ shipping fro 99 bucks though! and he "swears" it is in perfect shape, as long as the countershaft cluster is good im happy.
We'll have to wheel it up sometime! everyone i ride with is in rickity old jeeps!
My sami is under the knife for the winter though.
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Old 12-02-2009, 07:24 PM   #10 (permalink)
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I'll shoot you a PM so we don't PO the mod with yaking. It ain't Tuesday today.
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Old 12-02-2009, 07:40 PM   #11 (permalink)
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I hear that pulling a leaf or two out of the calmini pack softens up the ride quite a bit. That and longer shocks with the taller towers to give you a little more travel. I'll be doing some experimenting with it next couple months.
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Old 12-02-2009, 07:57 PM   #12 (permalink)
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I was going to try opening up the spring clamps first, see if that helps. I'm afraid it will sit a bit low after pulling leaves but I'm worried it'll be too high using the springs for SOA. As you said, it isn't a bad setup for the street but my riding mower has more flex.
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Old 12-02-2009, 08:09 PM   #13 (permalink)
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my suspension is about 10 years old. The retaining bolt sheared on 3 of the packs and I replaced them a few months ago. Apparently my clamps are just hanging there as well. Don't know how long those bolts have been sheared, but it doesn't seem to have softened up the ride any.
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