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01-04-2013, 07:28 PM
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#1 |
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Registered User
Join Date: Dec 2012
Location: Atl ga
Posts: 60
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Does changing tire sizes affect speedo?
Im running a set of 215 70 15's . Not sure wha thesE trucks came with originally. Thx
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01-04-2013, 07:37 PM
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#2 |
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Registered User
Join Date: Nov 2010
Location: Lolo montana
Posts: 361
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Re: Does changing tire sizes affect speedo?
i don't have a chart anymore but i believe a p215/75r15 is close to the originals.i run a 245/75r15 and mine is 5 mph off.some one here will have a chart for rotations per mile for each size.
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01-04-2013, 07:51 PM
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#3 |
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Registered User
 
Join Date: Feb 2012
Location: Pikeville, NC
Posts: 144
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Re: Does changing tire sizes affect speedo?
Yes! you can Google tire size calculator.
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01-04-2013, 08:33 PM
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#4 |
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Who Me?
Join Date: Sep 2010
Location: Royal Palm Beach, FL
Posts: 4,067
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Re: Does changing tire sizes affect speedo?
__________________
 Steve1997 Tahoe LT 4D 2WD (DD) 2001 Blazer 4D 2WD 1961 Apache 10 (sold) 1965 C10 Stepper (sold) |
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01-04-2013, 08:53 PM
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#5 |
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Senior Member
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,998
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Re: Does changing tire sizes affect speedo?
agree with above - answer is yes, but the easiest way to figure it out is use/borrow a gps to see how far you're off from reality. keep in mind that in many of these oldies, the rear gears have been changed also, and that will much more significantly throw off the speedo. If you crosscheck displayed speed on speedo with a gps, you'll at least have a mental correction factor that covers all things that contribute to your speedo being off. Or, you'll discover that you're pretty darn close. agree with others, you're pretty close to factory tire outside diameter - that is what matters when it comes to tire changes.
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