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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

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Old Mar 13, 2008 | 09:27 PM
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rmalottwtes30's Avatar
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Biggest tires

What is the widest, and tallest tire I can run, right now my tires are 235/85/r16. I am keeping the same rims and was wondering if I could run a wider tire. Thanks
 
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Old Mar 14, 2008 | 03:55 PM
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I assume you mean for your f250. I have 285/75-16 nitto terra grapplers on my my 86 f250. They've been fine but ya better stay away from mud.
 
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Old Mar 14, 2008 | 08:29 PM
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how do those terra grapplers handle the mud and snow? they look pretty good to me but ive never driven a pair of them? i have goodyear wrangler at/s on right now and im not very happy with them so im lookin for some new ones
 
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Old Mar 14, 2008 | 08:51 PM
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Well they're definately not for mud bogging but moderate stuff they'll do fine or if you have a lil speed (trac-lock helps too). I can't say about snow as we haven't had any here in a few years and it's never more than a couple inches. They drive fine, no road noise or anything like that. Although after I bought mine, I found out that they have a load range D and E in the particular size I have. I got the D load range which probably rides better.
 
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Old Mar 14, 2008 | 08:53 PM
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ok thanks! sorry i diddnt mean to change the subject
 
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Old Mar 15, 2008 | 09:41 AM
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32x12.5 were as big as I got on my F150, they rubbed in a tight turn, not exactly sure on the 250.
 
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Old Mar 15, 2008 | 09:58 AM
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If you are talking about keeping your stock 16X6 rims, they will be the limit on how wide of a tire you can SAFELY run.......

Some times you can find 16X7's in the junk yard, and you can obviously run a slightly wider tire.

If you are talking aftermarket, that's a whole other story and depends on the width.
 
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Old Mar 15, 2008 | 09:59 AM
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If you keep the same rims, then you can't go very wide. I had a f150, so it's a little different than your larger truck, but with the stock rims on it, I ran 31x10.5 tires, and they fit ok, but in a tight turn in the parking lot, they rubbed the radius arms(you do not have radius arms but you do have leaf springs in the same spot.

I ran the same exact tire on a aftermarket 8 inch wide chrome rim, and they did not rub in a tight turn. The aftermarket rims set the tires farther out, which gives you more clearance.

A guy I know at work has a 89 f250 diesel, and he's running 33x12.5 tires on his truck with no lift. But, he has aftermarket 10" aluminum rims, so that makes a lot of difference on his too.
 
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Old Mar 15, 2008 | 10:13 AM
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Anyone know what my tire actually measure by looking at the 236/85/r16? or do I need to actually go out and measure?

Yes there the stock rims. So im guessing the stock size tire is about all I can run? Im not looking at taller tires now I guess maybe just a little wider.
 
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Old Mar 15, 2008 | 11:36 AM
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You can safely run LT265/75 R16's. That's what I have on my truck.

I don't think you can put anything wider on them than that.

Best bet is to go to a tire website and look up the size you are thinking about. They have recommended rim widths listed for their tires.
 
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Old Mar 15, 2008 | 12:50 PM
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[QUOTE=Franklin2]

I ran the same exact tire on a aftermarket 8 inch wide chrome rim, and they did not rub in a tight turn. The aftermarket rims set the tires farther out, which gives you more clearance.

Rims come in different offsets, and if you get the wrong offset, they will actually make the problem worse.
 
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Old Mar 15, 2008 | 12:52 PM
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Originally Posted by rmalottwtes30
Anyone know what my tire actually measure by looking at the 236/85/r16? or do I need to actually go out and measure?

LT235-your sidewall is 235mm tall

85-the tread width is 85% as wide as the sidewall is tall

16-you have a 16" rim

LT235/85/16


If I remember right, a 235/85/16 is just about the same height as a 31x10.50 tire.
 
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Old Mar 15, 2008 | 06:26 PM
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Correct me if I'm wrong, but do you not have that backwards?

Example: 245/55 16's.

245 = 245mm wide
55 = sidewall is 55% of 245mm
16 = duh. wheel size.
 
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Old Mar 15, 2008 | 09:03 PM
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Yes, he did have it backwards. The 235mm is the tread width.
 
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Old Mar 15, 2008 | 09:34 PM
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Well I can only go so long without getting silly, .... so here goes- I checked with Bigfoot, and he says you guys aren't even close.
 
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