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JayChicago · 06-15-2021, 09:07 AM

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Doing the math:
34” tall tire has 107” circumference.
38” tall tire has 119” circumference, an 11% increase.

With the taller tire your 38 MPH top speed would increase 11%, to 42 MPH.

06-15-2021, 09:07 AM	#6
JayChicago Senior Member Join Date: Jan 2019 Location: Chicago Posts: 731	Re: 1938 85 1.5 ton gearing Sponsored Links (Register now to hide all advertisements) Doing the math: 34” tall tire has 107” circumference. 38” tall tire has 119” circumference, an 11% increase. With the taller tire your 38 MPH top speed would increase 11%, to 42 MPH.