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Stupid question time...whats the difference between forward and reverse?

Discussion in 'General Tundra Discussion' started by airgunner, May 31, 2019.

  1. May 31, 2019 at 5:50 AM
    #1
    airgunner

    airgunner [OP] New Member

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    So can some one explain to me why a lot of people report that after getting larger tires, they have some rubbing in reverse?

    What I mean is, if turning your wheel all the way to one side and backing up causes rubbing, shouldn't it rub just as much if you were going forward (assuming you are on a level surface in both cases)?
     
  2. May 31, 2019 at 5:53 AM
    #2
    sdde4n

    sdde4n New Member

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    Weight distribution is more pronounced in reverse.

    Also, you're assuming wheel is dead center in the wheel well, but that's based on how your alignment is done.
     
  3. May 31, 2019 at 5:54 AM
    #3
    xJuice

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    I would guess the bushings 'squish' enough that the wheel will move back and forth slightly enough to make a difference. I don't know :notsure:
     
  4. May 31, 2019 at 6:23 AM
    #4
    airgunner

    airgunner [OP] New Member

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    You wheel is in the same position relative to the wheel well opening regardless of direction
     
  5. May 31, 2019 at 6:26 AM
    #5
    15whtrd

    15whtrd Mr. Blonde

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    I always found that strange myself. I can only assume that things must flex at all the pivot points and bushings depending whether it’s forward or reverse.
     
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  6. May 31, 2019 at 6:30 AM
    #6
    Jim LE 1301

    Jim LE 1301 Camaro Lover, SSEM # 11,TTC#179

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    Ditto.
    I think your turning your wheels more in reverse like backing into a parking space or something like that. When your driving foward you really don't cut your wheels that much........just a thought.:notsure:
     
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  7. May 31, 2019 at 7:02 AM
    #7
    airgunner

    airgunner [OP] New Member

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    That seems more likely then any other reason I've seen so far?
     
  8. May 31, 2019 at 7:05 AM
    #8
    Boxer310

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    Its funny cause my wheels run only when I reverse turning the wheel left I cant seem to find the issue
     
  9. May 31, 2019 at 7:10 AM
    #9
    sdde4n

    sdde4n New Member

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    Best test I've done is turning hard and then putting in reverse and stepping on it a bit. Mine rubs there a tad, but not really at any other time. The physics is what it is, ears don't lie.
     
  10. May 31, 2019 at 7:12 AM
    #10
    airgunner

    airgunner [OP] New Member

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    You must be young if you believe that! lol
     
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  11. May 31, 2019 at 7:17 AM
    #11
    Sas

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    Lost track after #1.
    4WD can sometimes cause rubbing in the front as well when it doesn't in 2WD.
     
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  12. May 31, 2019 at 7:18 AM
    #12
    ChrisTRDPro

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    It's all to do with the suspension. Since you're reversing, the front of the truck dips down, which would mean you're compressing the front suspension, which would put the widest part of the tire closer to cab mount/bumper/etc, which is where you're rubbing. When you accelerate, the back of the truck dips down, which means the front lifts up causing the suspension to droop, pulling you farther away from the rubbing points.
    That's my guess...
     
  13. May 31, 2019 at 7:19 AM
    #13
    sdde4n

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    I am, except for the grey beard.
     
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  14. May 31, 2019 at 7:21 AM
    #14
    sdde4n

    sdde4n New Member

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    Thank you. You took what I meant to say and made it sound all smart-like.
     
  15. May 31, 2019 at 7:27 AM
    #15
    airgunner

    airgunner [OP] New Member

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    I get that but and for normal driving, I could see that but here's my hesitation on excepting that as the complete answer...

    If I was checking tire fitment, I would turn the wheel fully to both directions and try going both forward and reverse to check for clearance but I would be doing that very slowly which would not induce the compression you are referring to. Even during normal driving, I very rarely back up fast enough to cause a noticeable amount of weight transfer or suspension compression but maybe that's just me?
     
  16. May 31, 2019 at 7:53 AM
    #16
    saybng

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    Exactly what Ron just pointed out!!
     
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  17. May 31, 2019 at 8:11 AM
    #17
    JoshuaA

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  18. May 31, 2019 at 8:13 AM
    #18
    JoshuaA

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    I get this, along with rubbing if I reverse on a decline. But no rubbing forward or reverse full turn on level ground in 2WD.
     
  19. May 31, 2019 at 9:15 AM
    #19
    15whtrd

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  20. May 31, 2019 at 10:28 AM
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    osidepunker

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    I'm sure you're sincere, but I really can't tell if the answers here are serious or not :notsure:

    No.

    No.

    Yes.
     
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  21. May 31, 2019 at 10:34 AM
    #21
    Black Wolf

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  22. May 31, 2019 at 10:57 AM
    #22
    Cement

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    Dont ask me to quote the source but I recall the conclusion, and the test used to draw it.

    Conclusion: your suspension flexes more (horizontally to the ground) in one direction than the other due to forces applied in either. Its not just weight transfer, but also drag on the ground by the tire and engine power applying in different directions thru the drivetrain.

    Test used: on a flat surface, after having pulled forward a few yards, put your foot firmly on the brake and put the truck in park. Have a friend take a long piece of painters tape and connect your fender, thru the hub of the wheel, down to the ground. With your foot still on the brake, put it in reverse. Now have your friend look at the tape. They'll see it torqued between the fender and hub, but not from the hub to the ground. There's your "flex". Can repeat the same thing in opposite order (meaning start the test from having stopped after reversing a few yards, then put in drive and check). And you can accentuate this affect by repeating the test on an incline in the direction you're testing (aka if you're testing the reverse movement, do this on an incline where the nose is higher than the tailgate. This essentially replicates the resistance to roll the tires have upon initial brake release.)

    Again I can't remember the source but I definitely remember thinking the test was sound and seeing the visual evidence. And I did read it on the internet so it must be true.

    Edit: cleaned up the test description, or at least what I remember of it.
     
    Last edited: May 31, 2019
  23. May 31, 2019 at 11:08 AM
    #23
    War Machine

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    Your truck moves faster going forward than it will in reverse. The body of the truck is able to stay ahead and keep pace with the wheels when going forward. That’s because it’s more aerodynamic in that direction.
    When in reverse, the truck falls behind a little, as there is more wind resistance. Since a wheel is a circle, it is equally aerodynamic when moving both forward or backward. It’s speed is the same regardless of direction, so the truck can’t stay ahead due to it not having the same advantage.

    So, you get the tire bumping the truck. Which is the way he wants it. Well, he gets it. I don’t like it anymore than you men.
     
  24. May 31, 2019 at 11:19 AM
    #24
    JoshuaA

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