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What is withh real tire sizes?

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

  1. POWERMAD

    POWERMAD 1/2 ton status

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    I had the pickup parked next to the K5 and I noticed that the 33's on the p/u looked bigger than the ones on the K5.
    At first I thought it was because the p/u's wheels were 16.5x9.75.
    I grabbed a tape measure and the tires on the K5 measured 31" I can see losing maybe half an inch with vehicle weight but 2". So I go to the 73 and the rear tires are 32" and the fronts are 28 1/2" (31x11.5).
    Where do tire companies get there dimensoins from? because to me a 33" tire should be 33" not a freaking 31"
    I mean I paid good money for a 33" tire.
    Or is this kind of crap normal in tires.
    SO if a guy wants a true 33" tire I suppose he has to shell out the cash for 35's ??
    Who makes a tire that is close to the true size?


    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  2. Jeff427

    Jeff427 1/2 ton status

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    This is why 35's are popular. My brother has a set of Super Swamper 33 SX's, and they measure slightly over 33" tall, and most people mistake them for 35's. Other than that, most all of the tires I have seen have been undersize (even Swampers other than the SX's).

    Jeff427
    <a target="_blank" href=http://muddog.off-road.ws>Mud Dog Off Road Club</a>

    <a target="_blank" href=http://lyonsdesign.bizhosting.com>Lyons Design Web Site</a>
     
  3. Pure Insanity

    Pure Insanity 1/2 ton status

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    Swampers run bigger on average than other companies. Put a 44 Swamper against a 44 Hawg, Youll notice the Swamper looks taller, and is. But the Swamper will look slightly narrower, because of the additional height.

    This is just my observation.

    I get all the excercise I need pushing my luck![​IMG]
     
  4. Gold Rush

    Gold Rush 1/2 ton status

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    Most tire brands especially tire mfg's like General and all the "cheaper brands" are severely undersized. Next set of tires you buy ask what size they will actually be on whatever sized rims you want them to be mounted on.


    David

    <a target="_blank" href=http://www.extremeblazer.com>http://www.extremeblazer.com</a>
     
  5. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    Totally depends on the individual brand of tire. My "35" Procomp MTs were about 34.7" when new. Other brands are off by varrying amounts. I would think that if 2 different tires "looked" close to the same size several things could be factors like, how much they are inflated, what load they are under, what size rim is being used, tread patern (hella agressive tires always look "phat"!), and, of course, wear on the tire.

    I don't work for a tire company or anything...those factors just seem to make sense to me. ;)

    Jason


    See the on-going build up of my '85 Jimmy! http://community.webshots.com/user/jekbrown
     
  6. DesertDueler

    DesertDueler 1/2 ton status

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    My 35" Goodyear MTRs are 35 inches on a nine inch rims.


    86 Jimmy 4"lift 35"MTRs Other cars 69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  7. Pugsley

    Pugsley 1/2 ton status

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    If you really want to get screwed up, take a BFG Mud Terrain, All Terrain, Baja T/A, and Baja "Project" and put them all next to each other - The Project will be exact, the Baja will be within ½", the Mud will be about the same as the Baja, and the All-Terrain will be about an inch shorter. Add an All-Terrain KO, and it's about 1/2" taller than the straight AT.

    Clean up on aisle 3!!
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  8. CaptCrunch

    CaptCrunch 1/2 ton status

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    what size rim are those 35" Pro comps on... my 35" MT's are about 33.5" on a 15x10 rim and 36 psi or so in them.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  9. RedDwarf

    RedDwarf 1/2 ton status

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    Manufacturers measure the inside of the molds they use to make the tires. When the tires come out of the molds and cool off, they shrink some. How much they shrink depends on the tire's constuction and the rubber being used.

    Why they can't figure out what size the tire will be when it's done and mark it accordingly(even if they had to resort to trial and error) I have no idea. I guess some of the new companies like Procomp and Parnelli Jones are catching on.

    As to Swampers, Jeff427 is right, not all Swamps are true-height like the 33"s. Mine aren't.


    Lift It, Lock It, LIVE IT!!!
     
  10. CV202

    CV202 1/2 ton status

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    Maybe they're just nickel and diming us to death! Cheap bastards [​IMG]

    Why do people keep calling it a Bronco!!!!! [​IMG]
     

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