rockcrawler wheels on '79
Post Fiend
Joined: Jul 2003
Posts: 11,945
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From: Spokane, WA
Originally Posted by 74 F100 351m
I'm going to put 15x12 on my 78 f250 4x4. I know I will have to grind the calbers some to get the wheels no, but the choses of tires is worth it.
One more thing to keep in mind: Alloy wheels are thicker (material wise) and will give you less clearance between the wheel and caliper than a steel rim of the same size. If you're trying to run an alloy and it just barely rubs then a steel rim will typically clear just fine. If you run a steel rim and it's very close to touching the caliper don't buy an alloy rim of the same size . . . it won't fit.
Elder User
Joined: Nov 2003
Posts: 705
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From: Okla.
I wish my scanner worked I would show you some photos. A 32" tire sets about 1 1/2" up past the rocker panal, what size tire do you think will fit without any cutting? I'm thinking 40's? I thought you didn't have to grind that much to get 15's on it. And now that I've seen your rear disk set up I'm thinking that's next on the list,but not to sure about the hydro assist. I realy like the way the SX's wear, but that is on a lighter truck and on the back.
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Freshman User
Joined: Apr 2005
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Originally Posted by Thomasm67
Definately go with 16's you have alot of choices in rims and tires. If you stay with the original rims then tire size is limited due to that your original rims are only 7 inches wide If your not planning on doing a offroading but if you wanted some bigger tires then go with 16's like 16x8 or 16x10 and so forth.I have on my 76 Hiboy 16x8 black wagon wheels with 35/12.5/16's.
Post Fiend
Joined: Jul 2003
Posts: 11,945
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From: Spokane, WA
The only crappy thing about that little backspacing is if you drive on the street it will most likely put the tires out far enough to require flares (or tickets 
). Wheel bearings don't really like it either but if they're in good shape and the preload is right they should be okay.
). Wheel bearings don't really like it either but if they're in good shape and the preload is right they should be okay.
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Freshman User
Joined: Apr 2005
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Alright...while we are kinda on the subject of backspacing, does a backspacing of 2.75" make the tires stick out farther than a spacing of 4.25"? I thought it was the other way around, but Kubota and Ivanribic's responses make it seem like the 2.75" makes them stick out
Elder User
Joined: Nov 2003
Posts: 705
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From: Okla.
If you have two wheels both are 10" wide. One of them has a 4.25 back spacing then 5.75 would stick out. The other one is 2.25 back spacing then 7.75 would stick out.
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Post Fiend
Joined: Jul 2003
Posts: 11,945
Likes: 3
From: Spokane, WA
Backspacing is the distance from the mounting surface of the wheel inner side that mounts against the drum or rotor) to the inner lip. Less backspacing means more tire sticks out. I think the stock tires ran about 4-4.5" of backspacing roughly.
