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  1. #1
    Join Date
    Dec 2010
    City/State
    Canyon Lake, TX
    Scrambler Year
    82 Scrambler
    Year Purchased
    2010
    Posts
    51

    33X12.5x15 on 7" rims

    Hey guys,
    Got a technical question that i need some help with. I currently have the stock wagon wheels 7x15" on my scrambler with 30x9.5 tires. I've recently added a 4" lift and would now like to change to a bigger tire. I found a new set of tires that are33x12.5x15.

    My question is: will these tires fit on my 7" rims and will it affect the drive/horsepower/gas mileage etc?

    thanks in advance!

  2. #2
    Join Date
    Feb 2010
    City/State
    Colorado Rockies, CO
    Scrambler Year
    '81 CJ-8
    Year Purchased
    2010
    Posts
    89
    I checked Bridgestone, B.F. Goodrich and Goodyear in the 33x12.50x15 size. All 3 manufacturers recommend wheel width of 8.5 - 11". Find out what tire you want and check the manufacturer's specifications.

    Going from a 30" to 33" tire will affect mileage and horsepower. The bigger tire will have more rolling resistance and wind resistance. Your lift will affect these as well. Going to a different size tire is like changing gears - you will notice a difference. Just how much depends on your current axle ratio. Google "tire size calculator" to find out just how much of a difference there will be.

    This is just all of the fun involved in the modification process.

  3. #3
    Join Date
    Jan 2003
    City/State
    Yorktown, Va
    Scrambler Year
    81' 4cyl, 85' 6cyl
    Year Purchased
    02-05'
    Posts
    3,100
    If you really want to keep those 7" wide rims then go with a 33x10.50x15 BFG makes a pretty good set either in MT or AT.

    If you are going wider than 10.50 really look into a 8 or 10" wheel. You can get a set of Black Steel Rock-Crawler style wheels pretty cheep.

    And yes it will affect MPG usually making it worse.

    Carl
    Projects:
    81' CJ-8, 85' Rust bucket, 84' CJ-7 frame off, 81' Project
    Driveable: 01'-TJ Sport

  4. #4
    Join Date
    Mar 2010
    City/State
    Millersburg, MO
    Scrambler Year
    1982 SR
    Year Purchased
    2010
    Posts
    8,468
    I'm running 33x12.50 BFG AT's on Factory 15x7 rims. I haven't had any issues but I did need to air down a bit more so the tires wear evenly across the tread. with a 12.50 tire an 8" rim is great especially for offroad. The narrower rim holds the tire on the wheel better and you have less of a chance of breaking a bead off. On road an 8 - 10" rim is ideal.

    1982 Jeep Scrambler SR
    Build Thread Here:http://www.cj-8.com/forum/showthread.php?33026-FINALLY!!!-A-Build-Thread-of-My-82-Scrambler!
    1984 Jeep J10 "Plain Jane"
    2000 Jeep Cherokee XJ

  5. #5
    Join Date
    Dec 2010
    City/State
    Canyon Lake, TX
    Scrambler Year
    82 Scrambler
    Year Purchased
    2010
    Posts
    51

    thanks

    Thanks all for the advice. I went ahead and went with the 33"X12.5"X15" AT and for now...on the 7" rims. I may try and find some 8.5" inch rims soon if the 7" don't measure up..

  6. #6
    Join Date
    Sep 2010
    City/State
    Glassboro, NJ
    Scrambler Year
    1984 Scrambler
    Year Purchased
    2010
    Posts
    908
    So, is it ok to put the 33x12.5 tires on the 15x7 rims?

    Karl

  7. #7
    Join Date
    Jan 2003
    City/State
    Yorktown, Va
    Scrambler Year
    81' 4cyl, 85' 6cyl
    Year Purchased
    02-05'
    Posts
    3,100
    It can be done. Is it right?

    No. It adds a lot of crown to the tread.

    Officially the 8" wide rim is a little small. But IMHO is it the right combo.

    The 10" seems too wide and exposes more of the wheel lip to rocks.

    Perfect would be 15x9. But no one make these.

    There are a lot of 17x9's out there to handle the rock racing guys as the 12.5" tread width is really popular in that sport.



    Carl
    Projects:
    81' CJ-8, 85' Rust bucket, 84' CJ-7 frame off, 81' Project
    Driveable: 01'-TJ Sport

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