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Swapping tire size

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Skiharleydoo, Nov 28, 2022.

  1. Nov 28, 2022 #1
    Skiharleydoo

    Skiharleydoo Bobtail Member

    11
    4
    Jun 12, 2017
    Rockies
    0
    I currently have 11R22.5 tires on my 2022 Western Star 5700XE.
    I’m going to swap to 295/75R22.5.

    How much will my speedometer be off?

    Can a dealer change the settings on the ECM to correct the speedometer?
     
    Skiharleydoo, Nov 28, 2022
    Skiharleydoo, Nov 28, 2022
    #1
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  3. Nov 28, 2022 #2
    Gridaxe5588

    Gridaxe5588 Light Load Member

    120
    164
    Nov 23, 2022
    0
    Running the same on my 16 Cascadia and mine is only off 1 MPH.
     
    Gridaxe5588, Nov 28, 2022
    Gridaxe5588, Nov 28, 2022
    #2
  4. Nov 28, 2022 #3
    062

    062 Road Train Member

    6,276
    33,787
    Oct 20, 2013
    0
    Vehicle Speed Calculator
    It'll vary a little depending on specs and speed, but around 2-4mph. Yes dealer should be able to help.
     
    062, Nov 28, 2022
    062, Nov 28, 2022
    #3
    Skiharleydoo Thanks this.
  5. Nov 28, 2022 #4
    aussiejosh

    aussiejosh Road Train Member

    4,761
    5,563
    Aug 28, 2009
    Airlie Beach QLd
    0
    Depends on the diameter if there is not much difference you'll find it will hardly make a difference. I would not worry to much about it. As the police will usually allow most vehicles a certain percentage over the speed limit anyway.
     
    aussiejosh, Nov 28, 2022
    aussiejosh, Nov 28, 2022
    #4
  7. Dec 9, 2022 #5
    Skiharleydoo

    Skiharleydoo Bobtail Member

    11
    4
    Jun 12, 2017
    Rockies
    0
    My speedometer was 3mph off with the smaller tires. Updated the ECM to 509 revaluations per mile. Problem solved.
     
    Skiharleydoo, Dec 9, 2022
    Skiharleydoo, Dec 9, 2022
    #5
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