Speedometer Off Even After Changing in Forscan

[Etl330]

Long story short my truck came with 275/60/20 Tires but I found a great deal on 275/55/20 snow tires. I updated the size in Four scan to the millimeter readings. I’m able to find on the Internet And my speedometer is still off at 75 miles an hour compared to Waze by about 4 miles an hour. Waze says 75 and the car says 79. Any tips would be appreciated.

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[Aonarch]

You need to keep making changes until the speedo matches GPS.

I have my 34s set to basically a 32.

 

[Etl330]

You need to keep making changes until the speedo matches GPS.

I have my 34s set to basically a 32.

Thank you… Yes, I got it now. What a pain.

 

[Ricksc]

Did you multiply the new mm size by .967 then enter that number. Thats what I was told on her and I am with in 1/2 mph of gps

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