Stock Tire Size

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I think the OE size was 235/75X15. 31X10.50X15 fits fine too though, and is a common upgrade. The OE diameter is around 29" (varies from make to make).
 
do you mean gas mileage? if so, don't worry, the only way my 60 saves gas is when it's parked...as far as speed and mileage go, going from a 235 to a 31 isn't that much...maybe 2-5 mph on the speedo depending on how fast your going. As far as mileage, it's only gonna be difference in tenths...not anything noticeable
 
my 61 has 31x10.5 x 15 on the door, from factory
 
Accoring to my GPS, my 60 reads 10% slower than actual speed with 31 x 10.50 x 15 tires. 30 MPH is really 33, 50 MPH is really 55, 70 MPH is really 77. etc. Seems consistant. With 235 x 75 x 15 tires it was pretty accurate.
 

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