tire size for a correct speedometer reading - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OldGMJon · 04-06-2015, 01:40 PM

I have a set of 245 75R 16 tires on my C10. My speedometer says I am doing 42 MPH but I am really going 50 MPH.
I saw on one thread that some one riding 75's was saying it was throwing off his speedo.
Assuming it is tire and rim size causing my incorrect reading, I picked up a set of 15" nubbies.
I have searched out a hundred threads but can't seem to find anyone stating what size tire would make my speedometer show a closer to correct reading.
15" rims seem to have a limited options but was thinking maybe 235 70R may do. Anybody got the info?

04-06-2015, 01:40 PM	#1
OldGMJon Registered User Join Date: Oct 2014 Location: Albion, Ca. Posts: 414	tire size for a correct speedometer reading I have a set of 245 75R 16 tires on my C10. My speedometer says I am doing 42 MPH but I am really going 50 MPH. I saw on one thread that some one riding 75's was saying it was throwing off his speedo. Assuming it is tire and rim size causing my incorrect reading, I picked up a set of 15" nubbies. I have searched out a hundred threads but can't seem to find anyone stating what size tire would make my speedometer show a closer to correct reading. 15" rims seem to have a limited options but was thinking maybe 235 70R may do. Anybody got the info? __________________ Projects: 65' Chevy C10 swb (rebuilt chassis) 65' Chevy Panel swb 64' Chevy C30 flatbed "above" 80' C30 "beneath") Parts: 66' GMC 2503 & 65' GMC I1500

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