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?
Swapping tire size
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Skiharleydoo, Nov 28, 2022.
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Running the same on my 16 Cascadia and mine is only off 1 MPH.
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Vehicle Speed Calculator
It'll vary a little depending on specs and speed, but around 2-4mph. Yes dealer should be able to help.Skiharleydoo Thanks this. -
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My speedometer was 3mph off with the smaller tires. Updated the ECM to 509 revaluations per mile. Problem solved.