Putting large tires on trucks?

Discussion in 'Trucks and Trailers' started by allstar, Sep 18, 2003.

  1. allstar

    allstar LawnSite Senior Member
    Messages: 282

    I know alot of people like to put large tires on their trucks and others like to do this AND jack them up.What are the consequences,both positive and negative.of doing this?I would assume that a truck with large tires would ride less smoothly?Would gas mileage be affected?What else?
    I'm interested in trading my Ford Expedition and buying a new F150(I think the Lariat is the one I like most).I would like to put tires on it just A LITTLE BIT bigger than the standard ones.The reason is mainly cosmetic;I simply think it would look good.What do ya'll think of this decision?Also,what kind of reputation does this truck have?Over the years I've bought 2 Explorers and an Expedition,and they've been great,but I have very little knowledge about Ford trucks as well as trucks in general.I know alot of you guys have trucks and I would appreciate any advice you could give me. Jim
  2. JohnK

    JohnK LawnSite Member
    from Seattle
    Messages: 53

    Gas mileage is effected, negativly, as is pulling power. When I went from 265/70/16's to 285/75/16 on my Suburban my mileage dropped about 10%.

    Bigger tires and lift kits can also cause the suspension to wear sooner. If its a new truck lifting over a certain amount can void the warrenty as well.
  3. henry2002

    henry2002 LawnSite Member
    Messages: 13

    If you are buying a newer truck buy one with 17" rims that make it look bigger with the 4x4. This should be big enough to do what ever you need and it still rides good and pulls good. If you want a bigger truck buy a 250 psd that will pull good. the 150 is the best selling truck. i have had two of them a 97 2 wheel drive and i just bought a 2001 4x4 lariet i love the leather is is ever forgiving. no problems with either one
  4. HighGrass

    HighGrass LawnSite Bronze Member
    from Z5 MA
    Messages: 1,237

    You risk wear and tear and a higher than normal center of gravity. For general work, they aren't that much use.
  5. acetylene

    acetylene LawnSite Member
    Messages: 2

    One reason we dont put large tires on trucks here is because of the snow. You would want the narrower tires for better traction. I doubt u have much snow down there, but wider tires sill also hydroplane easier.
  6. GrassBustersLawn

    GrassBustersLawn LawnSite Senior Member
    Messages: 981

    I've got a 2001 Ford SuperCrew; 1998 Ford SuperCab and a 1999 Ford Expedition for my wife. ALL have been great. No problems to date. (Knock on wood.) Also, they have more head room in cab then any other brand I've tried. I'm 6'5" and hate banging my head on the roof every time I hit a bump. Don't do that with the Fords.

  7. Woody82986

    Woody82986 LawnSite Silver Member
    from DFW, TX
    Messages: 2,128

    I have some BFG All Terrain's on my 99 F-150 2 wheel drive. I believe they are 295-70-R16's They fit just fine in the wheel well. It knocks my speedometer off by 6 mph. So when it says I am going 55 I am really going 61. My gas mileage went down about 5% and yes it rides comparatively rougher than with the stock tires. But hey, they look way better!
  8. LawnScapers of Dayton

    LawnScapers of Dayton LawnSite Silver Member
    Male, from Dayton, OH
    Messages: 2,572

    are you really getting worse milage or are you just registering less milage per gallon due to the larger tire size???


  9. EagleLandscape

    EagleLandscape LawnSite Platinum Member
    Male, from Garland, Texas
    Messages: 4,350

    you are getting worse mileage. for example: i have 3.73 gears. that means for every 3 turns of the driveshaft, my axle turns .73 of a turn. but with bigger tires, it wont turn as much, therefore using more gas (more rotations of the driveshaft) to get where you want to go. Bigger tires also mean more "surface area contact" with the ground. So you will get BETTER traction with bigger tires as more rubber will be touching the pavement.

    Although, the bigger the tire, the more stress can be put on the axle. therefore causing some components to go out faster, such as u-joints, and CV joints (all post '87 chevy's and / all f-150's).

    If you are wanting bigger tires so your truck will look better, thats dumb. WHy spend money on something that isnt going to return a profit? Spend money on a new trailer, or better equipment.

    But if you are going to run 35" tires, get 4.10 and better yet 4.56 gear ratios in your axles.
  10. hoagie

    hoagie LawnSite Member
    Messages: 222


    Let me explain differential ratios quick...

    When someone says I have a 4.88 or a 4.10 it is the ratio of ring gear to pinion gear... meaning 4.88 to 1 or 4.10 to 1.

    If you have a 3.73 in the rear end, your ring gear has 3.73 times more teeth than your input shaft pinion gear...

    The larger your ring gear the more drive shaft rpms are needed to turn it the same # of times as w/ a smaller ring.

    Larger tires will effectively lower your differential ratio. (Sort of)

    BETTER mileage on the highway, but it will take more torque to get going from a stop.

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