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Tire + Lift Mathematics

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 79Guy, Sep 8, 2000.

  1. 79Guy

    79Guy 1/2 ton status

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    Ok, help me understand something.


    Does the four inch suspension lift increase the distance between the frame and the axles 4"? It would seem that should allow tires with a 4" larger radius, or 8" larger diameter. That would mean if I could run 31" with no lift, that I should be able to run "39 with a 4" lift.

    I know it doesn't work that way - that you can't run "39 with a 4" lift. But can someone help me understand why doesn't that work?



    '79 Guy
    1 Blazer - 7 Children
    http://79guy.coloradok5.com
     
  2. Boss

    Boss 1/2 ton status Author

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    You might be able to , but you would really have to hack the fenders. remember, the fender on your K5 is like the box shape, doesn't allow large tire to fit right. 35" tires will rub on a 6" lift at full flex. When I ran a 4" lift and 3" body lift, my 35" tires still rubbed at full flex. That's b/c the size of the fenders. Not really the lift. The lift helps fit larger tires w/o cutting fenders and driving etc. But if you hit the trails a lot, then you would eventually have to cut them.
    Boss
    http://www.boss.coloradok5.com

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  3. Espen88k5

    Espen88k5 1/2 ton status

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    You replace stock springs with bigger ones. Bigger the springs the bigger the bounce when you dump down on them. Heard of a nose-blead lift? Thats 7 add-a-leafs stacked on top of each other in order to get 4 real inches of lift. It will not bounce at all and will be like driving a locomotive on asphalt. There you can put 39 incers with only 1/4 clearing to the fender and it will never touch.
    Hope I helped some.

    http://www.espen88k5.coloradok5.com
     
  4. 79Guy

    79Guy 1/2 ton status

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    Thanks. I appreciate your response.

    So, a 4" lift might be 4" higher when setting still. But under compression, a lot of the extra 4" is lost.

    Right?

    '79 Guy
    1 Blazer - 7 Children
    http://79guy.coloradok5.com
     
  5. AZK5

    AZK5 1/2 ton status

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    The answer to your mathematical question is the fender increases in height by ~4" but it does not increase the radius of the fender opening at all. The fender opening is still the same size so a large tire will hit the front and or back of the fender opening. The large tire won't strike the top of the fender because it moved up 4" due to lift.
    CB
     

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