what is stock tire diameter? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

coggonobrien · 11-19-2010, 06:54 AM

just curious how much (if at all) my speedometer is off with 31/10.5r15
Thanks,
David

rsavage · 11-19-2010, 07:41 AM

If you have someone with a gps you could borrow it and read what actual speed was vs. speedometer readout at commonly used speeds i.e. 30mph, 45mph, 60mph. Most gps units have a mph function. You are probably 3-4" higher than stock original tire (depending on truck) so it would be my guess you will be off a ways. For example, if the original tire was 28" tall and you are running 31" tires, your tire is 10.7% larger in diameter.

11-19-2010, 06:54 AM	#1
coggonobrien Registered User Join Date: Mar 2008 Location: Coggon, IA Posts: 580	what is stock tire diameter? just curious how much (if at all) my speedometer is off with 31/10.5r15 Thanks, David

11-19-2010, 07:41 AM	#2
rsavage Registered User Join Date: Aug 2009 Location: Alden NY Posts: 2,705	Re: what is stock tire diameter? If you have someone with a gps you could borrow it and read what actual speed was vs. speedometer readout at commonly used speeds i.e. 30mph, 45mph, 60mph. Most gps units have a mph function. You are probably 3-4" higher than stock original tire (depending on truck) so it would be my guess you will be off a ways. For example, if the original tire was 28" tall and you are running 31" tires, your tire is 10.7% larger in diameter. __________________ 1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7

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