1. #1
    I recently put 31's on my TJ and I know that in changing the tire size that the speedometer will not read accurately anymore. My question is... Does changing the tire size affect the odometer reading?
    Thanks Jeepers!
    It's time to go topless today! It's 80 degrees and sunny in Chicago!!!

    Ray

  2. #2
    Yes, it will affect your odometer the same ammount it affects your speedeometer. If you go fast enough to turn your speedometer 60mph for one hour then you will add 60 miles to your odometer.
    Josh,
    You will not be forgotten

    O|||||O

  3. #3
    There is a percentage difference in tire height, say tire size increased by 10%. Your speedo will read 10% slower at a given speed, and mileage will accrue 10% slower. Using 10% as an example, the odometer will register 9 miles for every 10 miles actually driven.

    This percentage differs depending on stock tire size and the new tire size.

  4. #4
    http://www.bncoffroad.com/tire_gear_cal.html

    Here's a handy calculator...
    Unfortunately, it doesnt do metric
    \'82 CJ-7 - AMC 258 -
    Mods: Weber Carb, Borla Catback, Juicebox TFI, 31\" BFG AT, Powermaster 150a alternator, H4 headlights, blazer heater motor conversion, WORKING gas gauge.
    Now with 80% less rust!!!

  5. #5
    Anybody know what the gear ratio is on a stock YJ? I want to do the calc's but i don't know theratio.
    Mike
    It's still a Jeep, stock, locked or lifted. Rock on Jeepers Hooahh.
    '93 YJ, 3.5" Black Diamond lift, 31" BFG AT's, Opta off-road lights, Supertop, blacked out rims, Transmission cooler, Posi-lok, and more in the works

  6. #6
    Oh yeah it is a '93 6 banger with stock size tires.
    Mike
    It's still a Jeep, stock, locked or lifted. Rock on Jeepers Hooahh.
    '93 YJ, 3.5" Black Diamond lift, 31" BFG AT's, Opta off-road lights, Supertop, blacked out rims, Transmission cooler, Posi-lok, and more in the works

  7. #7
    I THINK 3.73.But I am not sure.

  8. everything you wanted to know about your axles.



    http://www.off-road.com/jeep/tech/axle/



    Rob :P :)

  9. #9
    Stock ratio on a fuel injected 4.0 6cyl is 3.07 unfortunately... I have the same thing... only a 91.
    91 YJ 4.0 5spd
    SOA + 1.5" reverse eye RE springs
    D44 LS Rear & ZJ Disks
    4.56 gears
    36"x14.5" Parnelli Jones'
    Jks discos
    Warn XD9000i
    Banks SS exhaust
    High Steer!
    And a bunch of home made stuff!

    Stock 2005 Loaded WK, for now!

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