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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

tire size...

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Old Dec 11, 2008 | 08:14 PM
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rangerruck's Avatar
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tire size...

could anyone here translate how to turn 235/75/15's into it's inch tire measurements, and vice versa? Also if you know the correct, or factory tire size for an 88' 4rnr, I would appreciate it. I am supposing that the factory size was best for gas mileage, unless anyone has a diff idea about that.
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Old Dec 11, 2008 | 08:17 PM
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Elton's Avatar
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From: Siletz,Oregon
try this http://www.4lo.com/calc/gearmetric.htm
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Old Dec 11, 2008 | 08:25 PM
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From: Temecula Valley, CA
the factory tire size is a best guesstimate.
the gear ratios are usually geared towards best economy though, since if they weren't, there'd be hell to pay for taxes.
and given that tire size, you're running a large 29 / small 30.
I run a slightly larger tire, 245/75r15 on my 91 2wd / automatic and get 21+ mpg around town.

Last edited by abecedarian; Dec 11, 2008 at 08:27 PM.
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Old Dec 11, 2008 | 08:25 PM
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Excellent!!!!
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