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Thread: How big??

  1. #1
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    How big??

    I just bought a 98 expedition looks like alot room in the fender wells, sits up nice, all stock but looks like I could fit somthing in there so how big of tires could I go?
    mud is good

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    I think the guy who ran one at tar hollow with is was on 265/75/16's and that looked about maxed. But my size may be off.

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    Call me dumb but whats that translate to 33's 31's bigger
    mud is good

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    its about a 31
    Paul

    1976 CJ 5 on 37s
    1984 CJ 7 on 36's
    1993 GMC K3500 6.5 Turbo Diesel

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    Ballpark common 16" metric tire sizes:

    245/75/16 = 31"
    265/75/16 = 32"
    285/75/16 = 33"
    305/70/16 = 33"
    315/75/16 = 35"
    Large: 1978 Ford F-250
    469 V-8: 340 HP, 525 TQ
    C6, NP-205, 4.10's, 42" TSL's on 15x8's
    D60: Detroit, 35 spline Alloy Shafts w/ Longfield Superjoints, Dedenbear Knuckles, Drive Flanges.
    1410 Driveshafts, D70-U Welded, 12K Winch, OBA.

    Small: 2009 Yamaha Grizzly 700 4x4

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    K I need a lesson in how to read the tire sizea here like whats the first numbers stand for 2nd last is rim? right
    mud is good

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    285/75/16:

    285 mm wide
    75% aspect ratio (sidewall is 75% of the width)
    16 " wheel

    The lower the aspect ratio = a shorter tire (it the forst # (mm) is the same. Example:

    A 235/60/15 is approx. 26" tall
    A 235/75/15 is approximately 28" tall
    Large: 1978 Ford F-250
    469 V-8: 340 HP, 525 TQ
    C6, NP-205, 4.10's, 42" TSL's on 15x8's
    D60: Detroit, 35 spline Alloy Shafts w/ Longfield Superjoints, Dedenbear Knuckles, Drive Flanges.
    1410 Driveshafts, D70-U Welded, 12K Winch, OBA.

    Small: 2009 Yamaha Grizzly 700 4x4

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    Just to expand on the above a little:

    285/75 R 16

    first number is width in millimeters, so:

    285 mm wide, divide by 25.4 to convert to inches: 11.2" wide

    Second number is aspect ratio, so 75 = 75%.
    Multiply 285 by 75% (.75) will equal one sidewall height = 213.75 mm
    Convert that to inches, so 213.75 / 25.4 = 8.4"

    So, starting from the top of the tire:
    - top of tire down to start of rim + rim diameter + bottom of rim to bottom of tire (or ground) = 8.4" + 16" + 8.4" = 32.8"
    Brad
    '90 Blazer - 6.2 diesel, 700r4, Dana 60, 14 bolt, locked, 39.5" Super Swamper TSLs, winch, rollcage, yada, yada, yada......

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    I do believe they where 285's not 265's. As I said earlier. But I re remember they looked about it for what would fit. I'd say on stock wheels and no lift a naorrow 33-11.50-16 be it. or the 285/75/16 They are real close in size.

    No math involved conversion.
    http://www.redrock4x4.com/tech/tire_calc.php

  10. #10
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    Definetly 285/75/r16 is what will go on there stock. I would also say for a truck of that design just get what you can out of running the largest tire on it with out doing a lift. Lifts on the expedition/f150 chassis of that generation are expensive and don't yield much trail performance. You just end up with a big top heavy truck. If you want the truck to be a driver/performer go with 285 muds and a detroit in the back. You'll have fun and have a good driver.

    - Jason

    PS Below is a decent Mud/Road tire and it is realtively inexpesive.

    Dunlop Radial Mud Rovers
    "Ask not what your country can do for you - ask what you can do for your country." -JFK

    2004 K1500
    1987 Suzuki samurai

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