Maximum Tire Size

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Nov 4, 2006 | 09:22 PM

mafearno

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Maximum Tire Size

I have an '89 F250 3/4 ton. I'm looking into putting bigger tires on it. I have the stock 16"x7" rims. I'm looking at putting on 285/75R16's. According to my calculations, they are 11.2" wide and 32.8" tall. I believe I should get 10" wide rims. I understand I'll have a speedometer offset. I have a few questions:
1. Can I put these tires on without modifications/lift?
2. What is the maximum size tire that could be put on without modifications?
3. Should I get 10" rims or will the stock 7" be OK?
4. What is the first place to hit with oversized tires? The fender? The frame?
5. Would you recommend a stabilizer shock for the tie rods?

Nov 4, 2006 | 11:33 PM

KC92F150

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From: Las Vegas

mafearno

Go to this site and click on thee Tire Fittment Guide. Hopefully it will answer your questions.

http://www.4wheelparts.com/4wp/produ...ension&man=STW#

Kevin

Nov 4, 2006 | 11:37 PM

preppypyro

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Joined: Aug 2004

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From: North Central Rural Sask.

Ok I cant answer all of your questions, but I can answer a few. For width of the rim, I run 285's on a 8 inch rim, and it fits fine, although I think a 10 inch rim would look a little nicer, wider, if you like that look.

Usually the first place to hit with oversize tires is the inner fender, or mudflaps on the front.

Hope this helps you a little.

Nov 5, 2006 | 03:28 AM

pud

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From: Quesnel, BC, Canada

ive got 285/75 procomp x-terrains on my stock 16x7 steelies. According to procomp they measure 33.4"x11.5". They fit fine on the rim. 10" wide might be pushing it, depending on the tread section. Youll hit your bumper first, and the fender where the mudflap would mount. The rear will be fine.

Nov 25, 2007 | 02:11 PM

89460250

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From: calgary alberta

i've got the same issue right now, i thought the guy @ the shop said biggest i could go was a 36, and i was looking @ a 33.5, the chart on 4x4parts.com says for my truck a 35 is a 4 and 36 is a 6... what all does that mean?

Nov 25, 2007 | 02:19 PM

bf250

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i ran 33in bfg on my 1989 f250 with no problems. did not do any severe off roading or anything past a farm field.

Nov 25, 2007 | 05:59 PM

71dusterdan

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From: Rockford, Il

my 89 came with 34x11.5 x16, when i bought it. the are back on for the winter on an 8" eagle rim. somebody already mentioned your bumper will hit first, appears to be my only problem spot. gonna step down to a 285/75/16, i think you will be fine . Dan

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Nov 25, 2007 | 11:18 PM

95F350XL

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From: Belle Mead NJ

You might have to cut the inner lip on ur bumper and it might rub a little on your leaf spring. I have 36's on my F350 and I just had to cut the inner bumper lip. But the F350 does sit a little higher then a F250. A 285/75/16 should be a 33x11. You will have no prob. If you want to get the 10" rims the tires wont be wide enough. With my 36x12.5x16.5 when I switched from a 16.5x8 to a 16.5x10, when I was mounting them at my school me and a buddy had to use starting fluid to get the beads to bead. That made a few kids crap there pants when they saw a 36" jump a few feet of the ground. Your 16x7 will be fine.

Nov 26, 2007 | 02:32 AM

#10

89460250

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From: calgary alberta

Quote:

Originally Posted by 95F350XL

when I was mounting them at my school me and a buddy had to use starting fluid to get the beads to bead. That made a few kids crap there pants when they saw a 36" jump a few feet of the ground. Your 16x7 will be fine.

starting fluid? i've used extention cords, and one time tried to use an air hose, (fill the gap with something, like an extention cord wrapped around the bead section of the rim and pull it out once the bead pops)air hose didn't work, the gap at the cross of the two ends leaked WAY too much air... but the extention cord worked the one time we tried that...