guzie
Well-Known Member
- Joined
- Jul 7, 2017
- Threads
- 2
- Messages
- 123
- Reaction score
- 91
- Location
- Grand Rapids MI
- Vehicle(s)
- 2018 Mustang GT350, 2019 Mustang GT
I went from a 305/35R19 to the 305/30R19 and the speedo was almost 4MPH off at 80. It bothered me enough so I recalibrated mine awhile ago with forscan.Honestly, 3/4 inch change in diameter is within the range of speed variance you'd see on the OEM tire between full tread and fully worn. I wouldn't sweat it that much.
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