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Old 03-17-2014, 07:15 AM
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Default 33x12.50 on 15x7, good idea or bad?

I know that 8" is the minimum recommended wheel width for a 12.50, but in a pinch is it still just a bad idea? Has anyone run 12.50 on 7"?
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"Squishy"-1988 Red Hilux Standard frame, X-tra cab, locked F&R, 5.29's, 35" tires and a SAS. In Moab

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Old 03-17-2014, 07:40 AM
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Would this be for a spare or as a regular tire? Maybe in a pinch for a spare but my feeling is it's too narrow to run normally. Rolling a bead on a trail is a PITA but having it happen on pavement is too much risk IMHO. There are lots of people who do it, especially Jeep guys. They are always stuffing bigger tires on than they should. Do you want to be like a Jeep owner, Justin?



Caveat emptor- I run 30x9.50x15 BFG ATs on factory 6" rims, which is I believe 0.5" below the specified limit...
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Old 03-17-2014, 07:40 AM
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Quote:
Originally Posted by Squishy! View Post
I know that 8" is the minimum recommended wheel width for a 12.50, but in a pinch is it still just a bad idea? Has anyone run 12.50 on 7"?
I ran 33x12.50x15 on my FJ80 with no problems. On these stockers...
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Old 03-17-2014, 01:28 PM
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I disagree with Dave A. I ran 33 and 35 12.50's on stock 7" rims. They keep the bead BETTER than wider rims. The tire sidwalls are actually pushing the bead into the rim, rather than trying to pull it off, like the guys running a 10" rim on a 12.50 tire. Looks better too.

The restriction, I think, is put there by tire companies because the narrower the rim, the more the center of the tread wants to cup up, or become convex, leading to increased center tire wear. However, i think that really only happens at higher tire pressures. I ran my tires at 33psi, and never had center wear issues.

I was able to air those tires down to 8 psi on those rims and never lost a bead. I did lose a bead several times on the same rims with my 33x9.5's.

Anyway, just my .02.
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Old 03-17-2014, 07:19 PM
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Default 33x12.50 on 15x7, good idea or bad?

Quote:
Originally Posted by DaveInDenver View Post
There are lots of people who do it, especially Jeep guys. They are always stuffing bigger tires on than they should. Do you want to be like a Jeep owner, Justin?



NOOOOOOO!!!!!

Thanks everyone I appreciate the input. Dave that's the logic I found myself using as well. Have you had any poor experience due to this? I'm interested to know.

Issac, thanks for the feedback. I ran 35x12.5 on 8" and had zero issues but I'm just struggling with 5.5" difference between tire and wheel. It *seems* to me at some point the angle of the bead bending inwards would create an issue making a good strong seal. Is 8" that threshold? 7"?

That said, you've done it and loved it, so that's pretty irrefutable. I guess I'm going to have to take the chance since I can't afford wheels anyway.
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"Squishy"-1988 Red Hilux Standard frame, X-tra cab, locked F&R, 5.29's, 35" tires and a SAS. In Moab

"Apollo"-1988, 2001 3.4L, Supercharged, 2.1" URD pulley, 2 1/2" Magnaflow exhaust, TO DO: SAS, Duals.

"Did you know the IFS was designed by Hitler himself to make the life of 4WD owners tough? Yeah, it's true, he saw a vision of the Devil and he told him to do it." -DaveInDenver
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Old 03-17-2014, 11:28 PM
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Quote:
Originally Posted by Squishy! View Post
I know that 8" is the minimum recommended wheel width for a 12.50, but in a pinch is it still just a bad idea? Has anyone run 12.50 on 7"?
Matt Farr ran that size tire (Goodyear M/Ts IIRC) on that size rim on his FJ40 for years. AFAIK he was happy with them. He had PS on that rig (Saginaw I think?) so the width wasn't an issue with steering.
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Old 03-17-2014, 11:45 PM
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Jeff speaks truly. Worked great, never popped a bead, wear was even.
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Old 03-18-2014, 06:48 AM
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Sweet. Thanks guys!
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-Justin Morgan, Toyota Technician (T-TEN)

"Squishy"-1988 Red Hilux Standard frame, X-tra cab, locked F&R, 5.29's, 35" tires and a SAS. In Moab

"Apollo"-1988, 2001 3.4L, Supercharged, 2.1" URD pulley, 2 1/2" Magnaflow exhaust, TO DO: SAS, Duals.

"Did you know the IFS was designed by Hitler himself to make the life of 4WD owners tough? Yeah, it's true, he saw a vision of the Devil and he told him to do it." -DaveInDenver
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Old 03-18-2014, 06:57 AM
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I just had those same tires moved on to the Taco last week. Those are 7" rims too and Big O didn't even question the width. They're doing fine right now.

I'm sure you'll do fine too!
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