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Discussion Starter · #1 ·
Anyone know what size backspacing I need to tuck some 20" tires under the rear without shortening the axle. I heard it was around 6 3/4" backspacing on a 8.5" rim?

What about 22" rims?
 

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6 3/4 is it!! I had lexani take blanks and shave off enough and drill our lug pattern, then test it on a dakota out there untill they would tuk the rear since I already have my rear set up done and the link bars all welded to the axle and all, and I belive that 6 3/4 is very close. check out my profile on streetsourcemag.com, THROWNSPRKS later
 

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Discussion Starter · #3 ·
I also need to know what the backspacing for 18"s would be, 17"s, 19"s rims. Trying to put together a guide so people can download for info. Any help would be appreciated.
 

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What about 22's ?! :?
 

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Discussion Starter · #5 ·
ok, 22's as well :)
 

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i do have to say the very best way to do it is shorten the rear..... its only gonna pay off in the long run and that way you wont have to mess with the body of the truck... for me its cheaper to narrow the rear anyway only 500 bucks!
 

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45mm needed on a 245mm wide 20" tire. Exactly. thats whats on mine. Just figured i'd bring an old post back to life. lataz
 

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idslamyou is right, 1 3/4" front side spacing will tuck a 20" wheel with a 1/4" gap between the rim and wheel well. As to a 22" wheel, i personally couldn't find a company that would make a 22x9.5 in a fwd type offset. I know coddington is flexible, and budnick will make anything you want, but budnicks cost an arm and a leg. And the lower you go on 22's the further in they need to be because of our upper bed line moving inward.
 

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I have been through this several times. It is basic math. I know for a fact that 6-1/8" back spacing on an 8" wheel will tuck. Is it smart to do that? Nope. Is 6-1/4" better? Yup, but not really worth the 1/8" difference. You really need 6 1/2" on an 8" wheel. That translates to 7" on an 8.5" wheel. Once you get so tall a wheel, or so low a truck (body drop) you have to start adding more for the rear. As impounded said as the rear rolls in and becomes more of an issue than the front. I lay full frame right now on 20x8 Intros with 6-1/8" backspacing. However, the this required some MAJOR trimming in the rear. My plans right now are to narrow the rear 1.5" on each side to allow for the wheels.

Now I could go ahead and interpret into all that sissy FWD offset crap, but I really don't feel like taking that much time. Besides I only do billet. I will give you this. In billet wheels (the example I used) the actual wheel is 1" wider than the stated with. So an 8.5" wheel is actually 9.5" outside lip to outside lip. So measuring 7" backspacing (to the mounting pad) on an 8.5" wheel leaves 2.5" from the mounting surface to the outside of the rim.

Offset on the other hand measures from the center of the wheel in milimeters. There are 25.4 mm in 1 inch.

There you go guys... put your high school math skills to the test. Oh, and have fun!
 

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You guys with the 6 3/4" backspacing....... is that to clear the lip inside the fender? My lip is cut away and I calculated a 6.25" back spacing on a 20 x 8.5" rim. That lip is about half an inch wide. Im ordering my Billet specialties in a couple days. So any help would be apreciated. Thanks guys
 

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okie ill throw one up i bought some 20's came off prelude yeah a prelude but anyhow the r 20x7.5 will they clear or do i have to do sum trimming and also what size c-nocth would be good the tire size is 225/35 20s and on the front what did u guys do for the electronics and battery i know u have to cut fender wells out
 

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battery is in the bed......extend the fuse box wires its mounted bhind the headlight as well as cruise control and the computers are mounted to gether and secured behind the headlight.
 

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that is definatly alot of help i havent even opened the hood up on the dakota to see all the stuff afraid to lol but anyhow i got these 20s at a hell of a deal they r about 6 months old driving on maybe 1500 miles i got em tires and all 400.00 i jumped on it here they r the websit is altwheels.com they r the blades
 
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