tire size difference

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 377pete, Dec 29, 2010.

  1. 377pete

    377pete Light Load Member

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    what would you recommend? i have 275-80-22.5 on truck know and i can get a good deal on 11r 22.5. what is the difference and would it affect speedometer and fuel mileage. the truck is a 96 freightliner fld 120 475 detroit 9 spd.
     
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  3. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    You should get better fuel mileage with low pros, and most guys I know running 11rs don't get the best fuel economy on them, but they will take more weight(higher load limit).

    Someone will probably relate the experience of actually doing this.

    They may ride better if you run them a little softer and also because of the larger circumference. They are roughly the same diameter as a 24.5lp. I have found that trucks on 24.5lp rubber ride better over pavement imperfections than similar trucks on 22.5lp rubber.
     
  4. paul 1052

    paul 1052 Heavy Load Member

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    Rolling resistance of different models of tires will have a greater impact on mpgs, that said with identical tires lo pros will always have a lower rolling resistance than tall rubber.

    Here's a chart of rolling resistance for different models of tires, the lower the # the better for your mpg.

    http://www.americamovesbytruck.com/rollingresistance.php
     
  5. heavyhaulerss

    heavyhaulerss Road Train Member

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    I thought the taller tire although maybe more rolling resistance, would do better on fuel cause the rpms on a taller tire are lower at the same speed of a smaller tire using less fuel ?
     
  6. special-k

    special-k Road Train Member

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    If it's good deal buy them. the speedo will read a little slower and the rpm will be a little lower at your cruise speed. Check it with a gps if you have one. Not anything to worry about.
     
  7. Cowpie1

    Cowpie1 Road Train Member

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    One thing to also consider on the 11R rubber is that it actually takes more energy to get and keep them rolling, on top of the fact that they have a higher rolling resistance than an equivalent low pro tire. Physics are just what they are.
     
  8. Prairie Boy

    Prairie Boy Road Train Member

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    Hook up a computer to the ECM and program it for the tire size that you're now running.
     
  9. Jfaulk99

    Jfaulk99 Road Train Member

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    I think the fuel would be trivial. The overall diameter size difference between 11R and 275's is only like 1.4" (41.9" vs 40.5" according to Michelin). I mean you might notice it if you were to switch from 275 22.5's to 11R24.5's but 1.4 overall is trivial. Some trucks might benefit from taller tires to help with low gearing.
     
  10. Prairie Boy

    Prairie Boy Road Train Member

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    which translates that the smaller tire will make 4.396 more Revolutions Per Mile only. Which in turn is slightly more than 1% of the RPM of the larger tire.
     
  11. heavyhaulerss

    heavyhaulerss Road Train Member

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    I was thinking, it may be better to be more concerned with the type of tire & it's longevity, then the size, if trivial in difference. with me, I have noticed a big difference in m.p.g. from having steer tires on my drives compared to knee dep lug's. the lugs was a noticeable degrease in m.p.g. over the steer type tire, but the lug lasted longer. this in my opinion is where the decision is important, not the increase in low pro vs standard.
     
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