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Alignment Questions

Discussion in 'The Garage' started by 1987Chevy, Jun 14, 2006.

  1. 1987Chevy

    1987Chevy Registered Member

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    I tried searching but could not find what i was lookin for. I was wondering what the toe in should be for a set of 33" radial tires, a set of 35" radials, and a set of 36" bias ply tires. Any help would be nice.
     
  2. 1987Chevy

    1987Chevy Registered Member

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  3. screamer*145

    screamer*145 1/2 ton status

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    I dont think it matters how big the tire is, you want a 1/4"-1/2" diffrence from the front of the tire to the back measuring from the center of the tires, with the front of the tire to be the lesser of the two measurments. That way they will center the truck on the road oppsed to fighting each other to pull the truck left or right. If i am mistaken some one else will correct me.
     
  4. mike n

    mike n 1/2 ton status

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    1/16" to 1/8" toe in is fine.
     
  5. goldwing2000

    goldwing2000 Guest

    I could be wrong but I believe the spec is actually zero toe.

    Tire size is irrelevant.
     
  6. ARAMP1

    ARAMP1 Aviator Extraordinaire

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    My GM shop manual calls for 1/8"-1/4" toe in.
     
  7. 1987Chevy

    1987Chevy Registered Member

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    thanks for all the info. What would be better an 1/8" or a 1/4"?
     
  8. mike n

    mike n 1/2 ton status

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    I don't think you'd notice any difference handling wise between the two.

    If you're using a tape measure to align the truck go for 1/8".
     
  9. 1987Chevy

    1987Chevy Registered Member

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    Thanks for your help. :bow:
     
  10. ARAMP1

    ARAMP1 Aviator Extraordinaire

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    If you can get it accurate within an eighth inch with just a tape measure, you're doing pretty good. :waytogo:
     
  11. tankie88

    tankie88 Registered Member

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    toe in info

    Hi all,after trying 2 differant blazer forums and getting no reply to a simple ??? i'll try here.Anybody know the toe in measurement for a 85 Blazer M1009???
     
  12. goldwing2000

    goldwing2000 Guest

    Ummm... see all of the posts just before yours?? :doah:
     
  13. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Actually, size does matter. :D
    If you set your toe in with a set of 33" tires then you swap to a set of 35" tires your toe in will have changed. Tire size doesn't matter as long as you are setting toe in with the tires you will be using.
     
  14. goldwing2000

    goldwing2000 Guest

    Actually, no... it doesn't if you align it properly.
    It's about the angle of the wheels, not the actual measurement at the outer edge of the tire. That's why alignment shops mount the machine heads on the wheels, not the tires. "Toe in" is used on a rear-wheel-drive vehicle to compensate for the spread that occurs when the wheels are pushed towards the back of the vehicle due to forward motion. The amount of spread is determined by things like ball joints, tie rods and control arm bushings and is not affected by tire size.
    Conversely, a front-wheel-drive vehicle is set with a little "toe out" because the wheels come closer together as the pull the vehicle forward, but that's irrelevant here.
    If you set your toe with a tape measure at the tread, chances are it's going to be wrong and yes, you'll have to fiddle with it if you change tire sizes.

    Since toe is the only alignment angle that's adjustable on a straight-axle truck (unless you put in adjustable ball joints), I'll gladly pay the local shop $20 to make sure mine is right.
     
  15. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Dude you better rethink how changing to a larger tire from a smaller tire without readjusting toe would affect your toe setting. Same goes for changing from a large tire to a small tire without readjusting toe.
     
  16. mike n

    mike n 1/2 ton status

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    An alignment machine doesn't know whether the truck has 31's or 44's on it, so what's the difference?
     
  17. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    An alignment machine shoots a beam in front of the tire so it knows where the tire is at. It does't need to know the diameter only where the front of the tire is. The heads that attach to the wheels are how this is achieved.
     
  18. mike n

    mike n 1/2 ton status

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    Right, but the head is mounted to the rim and not the tire. Tire diameter has no effect on what the alignment machine sees, so setting toe with 31's would be the same as with 44's.
     
  19. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Go ahead and set your toe with an alignment machine with a set of 33's on the truck then put 44's on and the toe will have changed. Trust me, setting toe with one size tire then doing nothing but changing tire size does change your toe number.
     
  20. broc944

    broc944 1/2 ton status

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    From my experience the larger the tires, the more the tires want to spread away from each other at speed. Toe, caster settings, etc. from the manual are for stock tires. As I said this is from my experience and what I have done on my own truck.
     

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