Different Size Tires

Magnum5.9 · Aug 11, 2015

Headed up to the mountains this weekend for some archery hunting and know it will be some muddy roads and am some what concerned with my tires.

I have new 285/75/16 MT but my spare is the factory 265 size tire and I know with solid axles it's a bad idea to put different sized tires and drive on pavement but how would it be if I used it as a back up in the mountians?

Being as the smaller tires would be able to freely spin more on the dirt/mud road and not break/stress my internal parts in my axle would it be ok to drive on it for a while if need be?

Thanks guys!

SilverStreak88 · Aug 11, 2015

I think it might get you out of whatever you're in depending on how heavy it is. You will definitely be stressing your axle on whichever side it's on. I would say if you are going to be running trails then it would be a wise investment to get a spare the same size so you don't have to worry about it.

Magnum5.9 · Aug 11, 2015

SilverStreak88 said:
I think it might get you out of whatever you're in depending on how heavy it is. You will definitely be stressing your axle on whichever side it's on. I would say if you are going to be running trails then it would be a wise investment to get a spare the same size so you don't have to worry about it.

Ive been looking everywhere for a 285/75 I can use for a spare but have had no luck

BBartow · Aug 11, 2015

You're fine. If you have rear lsd just make sure the tires are matching in the rear.

dodge dude94 · Aug 11, 2015

Finding used 285s are a *****. I used a 265 for my new spare.

Johnn123 · Aug 11, 2015

Its fine nothing will break. Its just a bunch of hogwash people keep regurgitating.

dodge dude94 · Aug 11, 2015

Johnn123 said:
Its fine nothing will break. Its just a bunch of hogwash people keep regurgitating.

You should know, you had three size tires on yours lmao

BBartow · Aug 11, 2015

dodge dude94 said:
You should know, you had three size tires on yours lmao

I think you mean me lol

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Magnum5.9 · Aug 11, 2015

I do not have lsd, open diff here on rear

MagSport · Aug 11, 2015

Magnum5.9 said:
I do not have lsd, open diff here on rear

Then your completely fine don't worry about it at all

Johnn123 · Aug 11, 2015

dodge dude94 said:
You should know, you had three size tires on yours lmao

Exactly lol. On my dakota for a while I had a 32x11.5 on one side and a 245/75/16 on the other. This was on the rear.

BBartow said:
I think you mean me lol

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I did too lol, 275/70/17, 315/75/16 and 285/75/16.

Magnum5.9 said:
I do not have lsd, open diff here on rear

Don't worry about it. Nothings gonna break. You could even use 4x4 offroad and I wouldn't worry.

BBartow · Aug 11, 2015

Johnn123 said:
Exactly lol. On my dakota for a while I had a 32x11.5 on one side and a 245/75/16 on the other. This was on the rear.

I did too lol, 275/70/17, 315/75/16 and 285/75/16.

Don't worry about it. Nothings gonna break. You could even use 4x4 offroad and I wouldn't worry.

I had 32x11.5 up front with 33x12.5 and 33x11.5 in rear.

Johnn123 · Aug 11, 2015

BBartow said:
I had 32x11.5 up front with 33x12.5 and 33x11.5 in rear.

I loveddd the reactions I got! "Your diffs gonna explode!" "You're gonna destroy that truck!" Lmao, never had any issues with the rear end on that truck. Trans had a computer issue but other that was good for a year after I finally got same size tires for it. I miss that hunk a junk sometimes.

Jimmy68 · Sep 3, 2015

What happens is the speed difference affects LSD clutch's. Also in an open diff the difference causes the spider gears to spin madly constantly like when your cornering. A locker would wig right out.
Clutch's will burn out because of the constant slipping (like in cornering) and spiders can heat up from the constant spinning and introduce heat into the diff. Heat being bad.
Will it screw up? It can but not likely. Go on a cross country trip and very possible. More so the more the tire difference. Like 33 on one side and 30 on the other. Example.

Different Size Tires

Magnum5.9

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SilverStreak88

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Magnum5.9

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BBartow

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Magnum5.9

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