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12-05-2004, 02:09 PM
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#1 |
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Registered User
Join Date: Nov 2003
Location: dallas/ftwoth
Posts: 112
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tire size?
if i put a taller tire on my truck will the speedometer read faster or slower than i am really moving?
 
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12-05-2004, 02:15 PM
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#2 |
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Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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It would read slower I think.
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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12-05-2004, 02:29 PM
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#3 |
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Registered User
Join Date: Feb 2003
Location: Mesquite, Tx
Posts: 396
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slower
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GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd |
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12-05-2004, 02:46 PM
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#4 |
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20' Daredevil (Ret)
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,722
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It'll read slower than your actual speed. Think of it this way - at a given rpm (and indicated speed), your tire will be rotating a certain number of times per mile travelled. Each tire rotation will push the truck forward a certain distance.
With a taller tire and at the same rpm, you will have the same number of tire rotations, but each rotation will push the truck a bit farther, since its circumference is greater. Since you will go farther in an equal amount of time, you are going faster than your indicated speed. I hope this makes sense. It was important to know back in the Sixties when I was putting taller tires on the musclecars - to keep the speeding tickets to a minimum! 
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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12-05-2004, 04:53 PM
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#5 |
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Registered User
Join Date: Mar 2003
Location: Morristown,TN
Posts: 481
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you can buy a gear for your speedo to correct it. i've seen it somewhere.
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