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Can I run 33s on my stock rims?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Piranha300, Jul 9, 2001.

  1. Piranha300

    Piranha300 Registered Member

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    I was just wondering because I dont feel like buying new rims.

    <P ID="edit"><FONT SIZE=-1>Edited by Piranha300 on 07/09/01 08:56 PM (server time).</FONT></P>
     
  2. ftn96

    ftn96 1/2 ton status

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    What width 33's are you talking about?

    When in doubt.....Use the Saws-all[​IMG]
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  3. Piranha300

    Piranha300 Registered Member

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  4. NoFear

    NoFear Registered Member

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    I ran 33x12.5x15 BFGs for a while on my stock 15x8 wheels for a while. They rubbed (no lift at the time) and looked kinda "baloony". I later put on a 4" lift, 15x10 wheels, followed by 35's about 30,000 miles later.

    <P ID="edit"><FONT SIZE=-1>Edited by NoFear on 07/09/01 08:59 PM (server time).</FONT></P>
     
  5. johnny reb

    johnny reb 1/2 ton status

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    I have 33x12.5 on my 15x8 wheels and they don't rub.

    1986 K5, New GM 350, Edelbrock Intake, K&N Air Filter, Flowtech Headers, Dual 3" Exhaust, 33" Pirelli Scorpion AT, 700R4, 3.42 gears
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    33x10.5x15's will fit with no rubbing. I believe the 33x12.5's fitting is totally dependent on spring condition, and vintage. (73-80, 81-91) I just know that 33x10.5x15's WILL fit on the 81-91 with stock wheels. They are a better bet than 12.5's unless you really need the 12.5's.

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  7. POWERMAD

    POWERMAD 1/2 ton status

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    I am running 33x12.5's on 8' ralleys and they look and are wearing fine.

    my truck's not dirty, it's earth tone paint
     
  8. jms

    jms 1/2 ton status Author

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    I'm running 33x10.5's w/o lift ('85, 2-leaf front). Still had to cut front fenders by about 1 inch (backside right, front left; the other two corners were fine!?) to prevent contact when stock suspension was compressed all the way with the wheel turned halfway to the right No problem when turned the left. So, taking a few measurements with steering turned in different positions might help.

    <A target="_blank" HREF=http://desertrider.net>http://desertrider.net</A>
     
  9. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    My 80 has 35x12.50s on stock 15x8 Ralleys. They look and are wearing great. My 73 has 33x12.50s on stock 15x7 white steel w/ hub caps. They look ballooned out and were had to mount-had to hold the tire bead below the rim's safty bead. They fit, but I wouldn't recomend it. 15x8=good;15x7=bad.

    Jim '80 GMC & '73 Blazer
    Tread Lightly!
    <A target="_blank" HREF=http://www.gmck5.rockcrawler.com>http://www.gmck5.rockcrawler.com</A>
     
  10. newyorkin

    newyorkin 1 ton status

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    Darn, I had a picture of my old Dodge race car with it's big wide racing tires on little tiny 15x8" police rims. I was gonna post it to show you how they balloon out. I also had the same tires on my camaro, with stock 15x7 rims, and they looked really funny. But they still performed, and held up fine for the 3 years I rode them like that.
    You can do it, but it may look a little funny. I don't know how they'd perform off road...

    Ratch
    <A target="_blank" HREF=http://k5.8m.com>http://k5.8m.com</A>
    **K5 - What more is there to life?**
     
  11. ftn96

    ftn96 1/2 ton status

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    Ok, I dont know what all your year models are for stock rim widths are but my 90 came with 7" wide stock rim and I wouldn't put no 12.50's on a 7". WOuld look like freaking Pillsbury Doboy.

    When in doubt.....Use the Saws-all[​IMG]
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  12. Piranha300

    Piranha300 Registered Member

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    I'm pretty sure my 91 came with 8 inch rims. I'm thinking of 33x12.5 Goodyear Wrangler MTRs, they recommend 8.5 and above, I'm just wondering if that half inch will make much of a difference. Most of my 4 wheeling come through snow drifts so I would like a little bigger tires than my 31s.
     
  13. ftn96

    ftn96 1/2 ton status

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    12.50's will be ok on 8's. They recommend these sizes for tread life. The smaller the rim the more round the tire gets when fully inflated and it causes the tire to wear prematurly in the center of the tire. But if they recommend 8.5's and you have 8's you should be ok.
    You can get 33" tires that come in 10.50, if I remember correctly, but that varries from company to company

    When in doubt.....Use the Saws-all[​IMG]
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  14. 6.2Blazer

    6.2Blazer 1/2 ton status

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    The standard "rally" style steel rims were 15x8's. The optional alloy wheels with the round style holes (similar to a A/E 589 or Alcoa Classic look) found on the later model K5's were 15x7's.

    You should have absolutely no problems with a 12.50 tire on an 8" rim.
     
  15. dyeager535

    dyeager535 1 ton status Premium Member

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    Are you running stock wheels? (15x7 or 8) I am running 3 leaf fronts, and have NO problem. 2 leaf fronts SHOULD allow more flex, and might cause problems, but even if I had 34's, I think they would fit with no trimming.

    just curious, don't want to steer anyone wrong!


    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    Up to a point, don't forget that the narrower tires will likely perform better than the wider ones in snow. That point of course is when the snow is so deep, you don't want to try and reach ground, which very well may be the case in Nebraska. Narrower is better to prevent hydroplaning and shallow mud too. Just some food for thought, although the only 33x10.5 out there right now is the BFG AT, no MT's. There are MT's in 9.5, but they are too narrow in most everyones opinion, for even a 7" rim. BFG claims they are coming out with new tires in August, but the person I spoke with had no idea if a 33x10.5 MT was forthcoming, which I think it should!


    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  17. jms

    jms 1/2 ton status Author

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    I have 15x9 rims with 4 inch backspacing; they were on the truck when I got it - didn't look aftermarket to me. Don't know whether rims like that ever came stock - you can see them at http://desertrider.net
     
  18. dyeager535

    dyeager535 1 ton status Premium Member

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    I know some here know what stock back spacing was. 4" sounds about right, but even 9" width shouldn't make a difference on the tires, since the tread, at least on mine, is what would hit the body if I could flex it far enough, which I can't, and won't , be able to do with the stock suspension. I'd like to know the stock backspacing on the 15" wheels, for this alone. I know for a fact the wrong backspacing canmake all the difference in the world.

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  19. dyeager535

    dyeager535 1 ton status Premium Member

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    Just looked at your pics. those look to me like stock wheels, but the picture is kind of dark. Steel grayish paint, small square holes in them, probably stock wheels. But AFAIK, there were never any 9" wide 15" truck wheels in that style, so wherever that measurement came from, if they are stock wheels, is either wrong, or they are aftermarket wheels made to look stock.

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  20. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I wouldn't want to run 33x10.50 tires on a fullsize truck for anything but the road. In mud they'd sink like crazy (even the 12.50s do sometimes) and in snow they're still too wide to cut down to the ground without spinning like a madman.

    You can run 12.50 tires on an 8" rim no problem. My 35s on the front of my truck are still on the stock wheels until I get my brake rotors turned and on, when it becomes 8 lug, and I will put the 15x10 chromies on the front then.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     

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