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post #1 of (permalink) Old 07-07-2001, 10:14 AM Thread Starter
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Tire /Rim Size

Worked out a deal with Loweguy for his tires ,31's, but not keeping the rims. I have a set of stock rims and was wondering if I should mount them on the 5.5's or look for a set of 7's or 8's? Will the tires footprint be smaller with the 5.5 rim? Thanks. Jim

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post #2 of (permalink) Old 07-07-2001, 01:13 PM
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Re: Tire /Rim Size

No the footprint would not be affected...You could use stock rims as so I have heard people usin ??*12.5's on stocks but none bigger than that!! Bottom line matters if you want to pay for rims......HOw wide are they anyway if they are 31*10.5's then they should fit on stock it just will not stick out like some people like!!

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post #3 of (permalink) Old 07-07-2001, 02:00 PM Thread Starter
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Re: Tire /Rim Size

They are 31x10.5's. When you say they will not stick out is that because of offset? Will they rub on the springs with stock rims? Thanks. Jim

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post #4 of (permalink) Old 07-07-2001, 02:08 PM
 
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Re: Tire /Rim Size

i'm running 10.5 "wide swampers on stock rims with good luck. the footprint is affected if you run high pressure because the 5.5 "width causes the tread to round out thus the shoulders don't make full contact--no problem with low (15-20 lbs pressure on road-lower off) no rubbing problems except left front rubs at full lock full compression--solved by panhard bar or spacers under wheel as i did. good luck!!

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post #5 of (permalink) Old 07-07-2001, 05:41 PM
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Re: Tire /Rim Size

The 31x10.5's will mount on stock rims, but those rims really are too narrow for the tires.

My spare tire is a 33x9.50 BFG M/T mounted on a stock rim, and despite the tall sidewalls and narrow width, the tread is very "rounded" because the sidewalls are really pulled in. The shorter, wider 31x10.50's you have will really wear unevenly in the center if you mount them on stock rims.

A general rule of thumb is to mount the tires on rims that are 0-2 inches narrower than the tread's actual width. Obviously, larger tires have more room for variation than smaller tires.

Most 33x12.50's have about a 9-to-10-inch-wide tread. The narrowest wheel you'd really want to mount them on is a 7-inch-wide rim. I had my 33x12.50's on 15x8's and that was (in my opinion) the ideal size. My current 33x14.50's have a 12.5-inch-wide tread and are mounted on 15x10's which are almost too narrow. Their height (as tall as some 35's) helps make up for that. At street pressure, only the center 9 inches of tread actually touches the ground because of how narrow (for the tire's width) the wheels are. But this helps reduce the rolling resistance from so much rubber rolling on the pavement, and it helps protect the edge of the rim and holds the bead better when aired down.

Most 31x10.50's have around an 8-inch-wide tread. A 6-inch-wide wheel would really be pushing the limits of width differentiation, and the stock 15x5.5 would be too narrow. If it was me, I'd go with a 15x7 wheel for the 31x10.50's.

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post #6 of (permalink) Old 07-07-2001, 11:59 PM
 
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Re: Tire /Rim Size

Seems like youd pop a bead going that wide.Why do you say that the footprint is no different with the 5.5s??Wider the rim,wider the print,right?

Hey,I know a shortcut......[img]/wwwthreads_images/icons/smile.gif[/img]
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post #7 of (permalink) Old 07-08-2001, 06:24 AM
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Re: Tire /Rim Size

Jim first thanks for the decals for the NE-fabfest I will be handing them out at the melt. 2nd Max has a set of
15x7 white spoke rims that he bought last year and only used down in paragon, (Not right off set for 33x12.50)
he only paid 25 each new so I think he will be lower
for the set. (They are the same type I ran on my 31's last year no rubbing.) Just another option. (You should run the right rim. 15x7 is good for 31's.)

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post #8 of (permalink) Old 07-08-2001, 06:44 AM Thread Starter
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Re: Tire /Rim Size

Glenn, I'll get a hold of Max about the rims. If you see him tell him that I'm interested in the rims and he can give me a call. You have my number. He maybe could even give them to Daxe when he comes down to get the chrome ones so no shipping. Glad you got the stickers in time. Have a great trip. Jim

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post #9 of (permalink) Old 07-08-2001, 06:47 AM
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Re: Tire /Rim Size

Well He's sleeping up in my guest room so thats no problem... (Doing a 16 v swap at the last moment on his wifes zook. (Going well but man...) I Know 2 of the rims are still mounted with 33's. I dought we can get them off before the melt so it will be a week.

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post #10 of (permalink) Old 07-08-2001, 06:56 AM Thread Starter
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Re: Tire /Rim Size

Time no problem at all. I won't even have the tires until next week. Just get all thoses rigs ready!! Time grows short. Jim

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