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18x9's and a 3" lift

Discussion in 'Wheels & Tires' started by Diverstj, Apr 17, 2010.

  1. Apr 17, 2010 at 9:13 PM
    #1
    Diverstj

    Diverstj [OP] Member

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    I've researched wheels, tires and sizes like crazy and I'm gonna' throw my selection out there for feedback before ordering. I'm a rookie at this kind of mod.

    '09 Taco DC TRD Off Road
    3" billet spacer lift w AAL's in back

    hoping to do BF Goodrich Mud Terrain KM2's 305/60/18 mounted on XD Hoss 18x9's with -12 offset (4.53 backspace)

    am I missing something?
     
  2. Apr 18, 2010 at 8:38 AM
    #2
    KPT

    KPT sees what you did there.

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    With 305's you are going to have to do a lot of trimming. You may also have to chop the body mount.
     
  3. Apr 18, 2010 at 8:41 AM
    #3
    bmxutah

    bmxutah Member

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    3'' Procomp lift 33'' bf ko 18'' wheels
    its gonna rub a ton! need to go bigger on the lift.
     
  4. Apr 19, 2010 at 5:15 AM
    #4
    Diverstj

    Diverstj [OP] Member

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  5. Apr 19, 2010 at 5:36 AM
    #5
    KPT

    KPT sees what you did there.

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    ^^^ You will still have to trim, but that is a size a lot of people are running with no problems after trimming.
     
  6. Apr 19, 2010 at 6:17 AM
    #6
    TacoSupreem

    TacoSupreem Dirty Trucker

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    Can I ask you a question? Are you a serious hard core wheeler? Just wondering because your about to make some pretty big changes. Gonna hafta cut up your new truck to fit those tires. Also those bfg ta ko's are extremely heavy and will kill your power and gas mileage. Just a few things to think about.
     
  7. Apr 19, 2010 at 7:39 AM
    #7
    jmed99

    jmed99 Well-Known Member

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    The 285s will "kill" the power and gas millage? I don't think so. What am I missing?

    285s with a 3" lift may require a little trimming but from my research you wont have to trim much. I know guys that run 285/70/17 BFG ATs with a 3" lift and didn't have to trim anything so I think it varies from truck to truck.
     
  8. Apr 19, 2010 at 7:54 AM
    #8
    TacoSupreem

    TacoSupreem Dirty Trucker

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    The tires he's looking at weigh as much as his stock wheels and tires combined! That can't be good for gas mileage?
     
  9. Apr 19, 2010 at 4:44 PM
    #9
    Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    You won't lose power (the engine still puts out the same amount of power), but it will feel less powerful. A taller, heavier tire is going to take more power to turn.

    As weight increases, the power required to turn the wheel is greater. Also, the further out that weight is, the more power it will take. Same with diameter. For two tires of equal weight, the larger diameter tire will be more difficult to turn. Combine the two (larger diameter and heavier) and you require even more power to turn it. More power to turn it means more gas, hence, less mpg.

    It's not as pronouced on the manuals as we're geared higher. But it is noticable.
     
  10. Apr 19, 2010 at 5:44 PM
    #10
    TacoSupreem

    TacoSupreem Dirty Trucker

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    Well said Mr. Evil Monkey!
     
  11. Apr 19, 2010 at 6:22 PM
    #11
    jmed99

    jmed99 Well-Known Member

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    I understand the physics....just didn't think 285s would "kill" the power and gas mileage.
     
  12. Apr 19, 2010 at 6:44 PM
    #12
    TacoSupreem

    TacoSupreem Dirty Trucker

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    ever try to pick up a bfg ta ko in a LT285/70/17? they are a very heavy and well made tire! our trucks come with those cheap rugged fails that dont weigh nothin cause they dont have any sidewall! lol I'm just sayin a stock truck may get 20mpg and when you start adding all that unsprung weight it'll drop a pretty good amount.
     
  13. Apr 19, 2010 at 6:53 PM
    #13
    Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    It didn't really kill mine (maybe 1mpg?). I still get 18mpg highway, which is good for a manual. I think it actually makes the manual's gear ratio more useable. I can't really speak to the autos though.

    I think it depends on the type of driving you do as well. If you're mostly city driving, then it will probably affect you more.
     
  14. Apr 19, 2010 at 7:01 PM
    #14
    TacoSupreem

    TacoSupreem Dirty Trucker

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    I guess i shouldn't have said kill? I mean it will have a negative affect on performance and gas mileage!
     
  15. Apr 19, 2010 at 7:02 PM
    #15
    kingtaco

    kingtaco Well-Known Member

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    I'm running 305-60-17 and I only had to trim a small piece of plastic on the inside front of the wheel well. My gas mileage didn't change much and I notice a small amount of power loss at take off but not enough to matter. The tires are a little heavier but like I said not enough to matter.
     
  16. Apr 19, 2010 at 7:04 PM
    #16
    TacoSupreem

    TacoSupreem Dirty Trucker

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    Well your odometer is off too so you can't use that to determine fuel economy.
     
  17. Apr 19, 2010 at 7:07 PM
    #17
    kingtaco

    kingtaco Well-Known Member

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    There are other ways to determine gas mileage and speed than your stock instruments.
     
  18. Apr 19, 2010 at 7:09 PM
    #18
    TacoSupreem

    TacoSupreem Dirty Trucker

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    ^^^This is true. Nav.
     
  19. Apr 19, 2010 at 7:20 PM
    #19
    Evil Monkey

    Evil Monkey There's an evil monkey in my truck

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    Plus mileage would be worse if you didn't take tire size into consideration.
     
  20. Apr 20, 2010 at 6:33 AM
    #20
    Diverstj

    Diverstj [OP] Member

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    Thanks for all the input. I ordered just the wheels last night. I'm not a serious off-roader. I'm a contractor in St. John US Virgin Islands and a lot of roads are unpaved and lots of rock. As for fuel economy I hope it doesn't get too much worse!! The island is mountainous therefore I only get about 12mpg as is (if I'm lucky!!!)

    The lift arrived yesterday and is going on shortly.
     
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