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33's on a 15" Rim

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by johnny reb, Nov 30, 2000.

  1. johnny reb

    johnny reb 1/2 ton status

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    33\'s on a 15\" Rim

    Anybody have a problem getting 33-12.50-15 tires to fit on a 15x8 wheel? I bought some 33s last night and the guy said that they may not fit on a 15x8 wheel, rather I would probably need a 15x8.5 wheel. I've never heard this before. I know all tire sizes vary slightly by manufacturer but should this be a problem? I'm hoping to get theses 33's to fit under my stock 86 K5 on a 15x8 wheel. I think these tires on a 15x8.5 wheel definitely wouldn't fit.
     
  2. ftn96

    ftn96 1/2 ton status

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    Re: 33\'s on a 15\" Rim

    yes they will go on there. But they will balloon out on the sides a little and will probably wear a little quicker that way. And as far as getting those under a stock K5 is a coin toss. You can probably get them in there but will rub in turns and when flexing, unless you cut lots of fender off.

    Don't you buy no ugly truck!
     
  3. Wheels

    Wheels 1/2 ton status

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    Re: 33\'s on a 15\" Rim

    They will fit on the 8" rims but they will be rounded in appearance. The center of the tread will wear out faster. They recommend 10" rims on the 33x12.50 to get the proper lay of the tire tread surface. Backspacing is the key here to keep the tie rods from hitting the rim. If they are the same rims that you had on before, they should work. Running lower tire pressure won't help with the flat tread aspect, centrifugal force will cause the center of the tire to be "thrown outward" as the speed increases. Also heat buildup will increase with reduced pressure (sidewall flexing).
     
  4. ftn96

    ftn96 1/2 ton status

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    Re: 33\'s on a 15\" Rim

    As far as back spacing, should 15x10 rockcrawlers that came off an 82k5 fit on my 90 Jimmy without hitting the tie rod?

    Don't you buy no ugly truck!
     
  5. 88glassbed

    88glassbed Registered Member

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    Re: 33\'s on a 15\" Rim

    The tires will fit the rims fine, 33x12.50s on factory steelies with the factory offset will be close to the outer tie-rod end, but will work. They would clear the body better with 2.5" lift.
     
  6. Emmettology 101

    Emmettology 101 3/4 ton status

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    Re: 33\'s on a 15\" Rim

    You'll be fine, mount'em up!!!!! I have seen tons of people running this set-up!!

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; http://emmett.coloradok5.com
     
  7. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Re: 33\'s on a 15\" Rim

    There should no problem putting a 33x12.50 tires on a 15x8 rim, and the there is very little difference between an 8" wide rim and an 8.5" rim. As far as making this tire and wheel combo work under the Blazer, 33's are generally a tight squeeze and could very well rub the lower corners of the fenders.
     
  8. HarryH3

    HarryH3 1 ton status Author

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    Re: 33\'s on a 15\" Rim

    I ran a set of 33x12.50x15's on an '87 K5. They were mounted on the factory alloy wheels (7 or perhaps 8 inches wide), with no lift. It got wheeled over some pretty decent trails in Colorado and never rubbed a tire against a fender or the suspension. Go for it! [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    http://ThunderTruck.ColoradoK5.com
     
  9. JimmyDie6.2

    JimmyDie6.2 1/2 ton status

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    Re: 33\'s on a 15\" Rim

    here's the info I have, from my experience. I am running 33x12.50s on a 15x10 inch American racing rim. I was told at pep boys, (where I bought the 4 rims and tires), that the 15x8s wouldn't work properly. The 33s on these rims have plenty of room in the back of the truck. The front needed SOME fender trimming, it is not noticeable. The tires never rub. As a side note though, the truck was a diesel, but now its a 350. The lighter motor allowed the body to go up at least an inch. the truck sits really nice. I have no aftermarket lifts.....js
     
  10. DMK

    DMK 1/2 ton status

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    Re: 33\'s on a 15\" Rim

    Had 33's on 15x7 factory wheels no problems. Did rub a little at full lock mostly to the left.
     
  11. jcg

    jcg 1/2 ton status

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    Re: 33\'s on a 15\" Rim

    I ran my 33's on factory steel rims for months before my lift was put in and I never had a problem. The only time they would rub was when I turned to full loc while climbing up something, and even then they didn't rub very much. I loved how the truck looked too, stock height with the fenders full of tire, sort of like a race truck. I've got a 4" kit now and the 33's are too small, pretty soon the plasma cutter is going to come out to fit 35's or 37's.

    Joe
    RIT Mini-Baja http://www.rit.edu/~bajawww
    Team Mudnuts http://www.mudnuts.org
     
  12. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Re: 33\'s on a 15\" Rim

    My personal experience involved a 4" lift and 33x12.50's on a 15x10 rim. I had no fender rubbing with the swaybar hooked up, but when the swaybar was unhooked they rubbed pretty good and required some trimming. A little more trimming now allows some 35s to fit.
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: 33\'s on a 15\" Rim

    Here's a pic of my Jimmy with 35x12.5's on a 6.75" rim.
    At the time of the picture the tires had 25,000 miles on them. You can see they are wearing evenly right across the tread. I'll probably get another 2 years out of these tires.
    [​IMG]

    Rene

    [​IMG]
     

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