Buying new tires

Discussion in 'Ask An Owner Operator' started by SHUNIA, Aug 12, 2015.

  1. SHUNIA

    SHUNIA Bobtail Member

    purchased a new to me 2006 freightliner columbia recently and have done some work to it recently including,

    4 new rear spring bushings
    4 new air bags
    6 new front spring bushings (including hanger bushing)
    new kaiser king pin kit

    it is going in for a alignment this weekend and will NEED tires. The truck came with 295/75r/22.5 tires from the dealer, some where down the line the previous owner switched them out for 11R/22.5's. My question is should I keep the 11R/22.5 or switch back to the original size of 295/75R/22.5? What are the pros and cons of having either? which would be better for me to run?

    also, just bought a trailer that has 11R/22.5s on it if it matters?

    TRUCK SPECS:
    2006 columbia
    455 HP detroit diesel 14L series 60
    13 speed manual trans
    3.42 rear ratio
     
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  3. oicu812

    oicu812 Medium Load Member

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    I think availability is about the same for each one. Assuming a final gear ratio of .73, the lo-pro would give a road speed of 66 @ 1400 rpm and the tall rubber would be about 68 mph. Not sure if there is any other major difference.
     
  4. SHUNIA

    SHUNIA Bobtail Member

    so staying with the 11R/22.5 shouldn't hurt anything correct? would the dealer be able to calibrate the speedometer to compensate for the new tire size?
     
  5. BoxCarKidd

    BoxCarKidd Road Train Member

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    Hey buddy, got a quarter? I change them up from low profiles (275 285 295's) to 11R's because any increase in ground clearance is an advantage here. It also makes for more uniform tire sizes, in this small fleet, allowing new steers and drives to be capped for trailer or drive axle use. The next guy will want LP'S for mileage due to less air turbulence under the vehicle and less sidewall flex etc. If pulling tanks it can affect your axle weighting. The 11R will give you about 6 mph more road speed than the LP at the same max rpm. The LP's must be the most economical for over the road usage as it appears all the majors use them. Thank about what is best for you, or do you have a lucky 8 ball?
     
  6. SHUNIA

    SHUNIA Bobtail Member

    thanks for the reply, my truck will be OTR and I am going more for fuel mileage savings then top speed. Is it common to have LP's on the tractor and 11R on the trailer as my new trailer came from the factory with 11R's
     
  7. BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    That is no problem even if it may not the most common. Would your truck get better mileage, at your desired average speed, at a lower engine rpm is where the answer begins to get cloudy. If you can get decent casing credit for your used tires and want to change sizes the quarter way land on its side. If I went that way I would look to change the trailer to LP's in time.
     
  8. double yellow

    double yellow Road Train Member

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    Aug 28, 2011
    State of Jefferson
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    Glancing at prices, it looks like LP tires cost less than 11R. A taller sidewall generally translates to more flex for a softer ride, better traction, and worse rolling resistance. As long as your 5th wheel height is OK, I don't see any problems running 11r though I'd go with LPs for overall economy...
     
    icsheeple Thanks this.
  9. Skate-Board

    Skate-Board Road Train Member

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    Merrimack, NH
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    How about some pics of your new truck and trailer? Are you leasing on to someone of getting your own authority?
     
  10. haycarter

    haycarter Road Train Member

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    There's minimal Difference in revolutions per mile between the 2 sizes..(roughly 3%)

    tyre.PNG

    i guess it comes down to which size you (or your Wallet) prefer..
     
  11. SHUNIA

    SHUNIA Bobtail Member

    thanks for clearing that up, I didn't think there was much benefit in going to a 11R tire. I will be switching them all back to the factory size of 295/75R/22.5 to save the headache of having it re calibrated.

    The trailer I purchased has 11R tires on it, I don't know what they use to spec what tires to put on trailers but can I go to a LP tire when they wear out? The tires on the trailer are very clean I should be able to get at least 1 1/2 years out of them. Also, will I have a problem running LP on the tractor and 11R on the trailer for now, what will it effect if anything?

    My truck is currently in the shop getting things fixed before I put it on the road, just a quick list of things getting done,

    rear spring bushings
    4 new airbags
    all front spring bushings
    rear brakes/drums
    oil pan gasket
    king pins
    oil change

    It should be done on Saturday and will go to the alignment/tire shop on monday to get a 3 axle alignment and brand new tires (drives&steers)

    I purchased the trailer yesterday, its a 2006 Vanguard 53' air ride, it has new brakes on both axles and tires are in good condition

    Once the truck is done and I pick up the trailer I will post some picture of my setup.


    I have finished all my paperwork for my own operating authority and just waiting for it to go active in a couple of weeks.



    I will be switching back to the LP's that came on the truck originally, hopefully my pocket will thank me.
     
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