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R20’s Questions

Discussion in 'Wheels & Tires' started by tundracap, Jan 9, 2019.

  1. Jan 9, 2019 at 12:25 PM
    #1
    tundracap

    tundracap [OP] New Member

    Joined:
    Aug 16, 2017
    Member:
    #9073
    Messages:
    243
    Gender:
    Male
    NC
    Vehicle:
    2017 CM Limited 4x4 Silver Sky Metallic
    Factory 275/55/R20’s on factory rims. No incentive to change or lift at this point. I’d like to go with a slightly taller tire when the time comes.
    I do trailer several different trailers at times.
    All other suspension components stock except I added a TRD rear sway bar.

    I believe I can go to 275/60/20’s without modification.
    Questions:
    How much difference in actual speedometer reading and actual speed can I expect, all other variables equal.
    How much change in the AWESOME fuel mileage I get can I expect.
    TIA
     
  2. Jan 9, 2019 at 12:32 PM
    #2
    Trooper2

    Trooper2 Premium Lone Star Member

    Joined:
    Feb 7, 2018
    Member:
    #12738
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    3,419
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    (Southern Suburban) Houston, TX
    Vehicle:
    2007 Tundra 5.7 L Double Cab TRD 2WD
    TSS 20's with Dynapro ATs, N Fab 3 Hoop Nerf Bars, TRD Wheel Locks, Pioneer AVIC-8100NEX, Masters Tailgate Replacement Latch with Camera, 1" Maxtrac Shackles, LED Interiors/Brake/Reverse/Cargo/Fog Bulbs, Fumoto Drain Valve, Toyota Aluminium Oil Filter Housing, TRD Shift Knob, Courtesy Door Projector LEDs with Toyota Emblem, Console Tray and Lower Divider.
    There are calculators on line that let you enter the tire sizes and the tell you the differences at given speeds. If going bigger, I believe the speedo will read lower by 1-2 at 60 MPH (maybe more). The difference is not linear, at 30 MPH it may be less <1. I don't think it helps the fuel mileage, may adversely affect it. But on the bright side, you are putting less miles on your truck. You can also have the tire size corrected in your ECM so everything jives.
     
  3. Jan 9, 2019 at 5:32 PM
    #3
    tightywhitey

    tightywhitey New Member

    Joined:
    Nov 25, 2018
    Member:
    #22190
    Messages:
    103
    New Orleans, LA
    Vehicle:
    2015 Toyota Tundra CREWMAX - Louisiana Edition
    I have 275/60/20 and my Speedo is dead nuts on. Verified with a few speedo apps. I haven’t noticed a change in MPGs yet. Only had them for about 500 miles.
     
    tundracap [OP] likes this.
  4. Jan 9, 2019 at 5:46 PM
    #4
    Adriver71x

    Adriver71x New Member

    Joined:
    Oct 10, 2018
    Member:
    #20406
    Messages:
    893
    Gender:
    Male
    First Name:
    Gerald
    Vehicle:
    2015 Tundra SR5
    Tow Mirrors
    I went to 10ply for towing and lost 1 1/2 mpg. Last service (30k) i did the fuel system clean and gained .9 mpg back. B12 fuel system cleaner.
     

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