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Thread: Using a 18" wheel with 3- 19" wheels as a temp spare

  1. #1
    Join Date
    Oct 2010
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    Miami, FL
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    57

    Default Using a 18" wheel with 3- 19" wheels as a temp spare

    Currently, I run 19" rims on my LR3 and have a 5th 19" spare too. I also have a 18" rim with a used tire that I'd like to take on an upcoming trip- just as a second spare. My question, if in the worst case senario, can i drive with a 18" rim and 3 19" rims for a short period of time- say 50 miles? or with the 2 sizes create an issue with the suspension?

    Any thoughts here? Thanks

  2. #2
    Join Date
    Apr 2012
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    San Francisco
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    Not sure about the Land Rover, but different size tires can wreck the transfer case on some 4x4 vehicles, such as Jeeps. Somebody with Land Rover experience will probably jump in, but I wouldn't want to do it for very far, if at all.

  3. #3
    Join Date
    Oct 2009
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    J10 M40 Oxfordshire UK
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    The rim size doesnt tell you that much , its the overall diameter that is important . If its a taller tyre ( ie aspect ratio /width) on a 18" rim it could be same diameter as a low profile tyre on a 19" rim . Spoacesaver spares are quite often a different rim diameter to the constant use road rims .
    The type of transfer case will also be a consideration , if its a simple differential type , then by the time the mismatch in size across axle is further diluted by the action of the interaxle differential there would not be that much of a rotational mismatch . If its a viscous centre diff its more critical due to a possible lock up situation due to rotational imbalance . This was why tyre replacement on Freelander one was critical factor.

    A bigger factor to consider is stability issues JMHO

  4. #4
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    Mar 2012
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    California
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    wheel size is irrelevant. overall tire diameter is all that really needs to be considered if this is intended to be a dedicated spare.

  5. #5
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    J10 M40 Oxfordshire UK
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    What are the tyre specs , on the 18 and 19 eg 265/75 r16
    1986 110 CSW TDi6
    1992 90 300tdi auto
    2001 Freelander TD4 Auto

  6. #6
    Join Date
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    PA US
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    Quote Originally Posted by tacr2man View Post
    What are the tyre specs , on the 18 and 19 eg 265/75 r16
    I hope neither the 18 or 19" wheel has an r16 on it!

  7. #7
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    Oct 2010
    Location
    Miami, FL
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    Ahh, sorry, my current running 19" wheel sizes are 255 55 19 and the spare set of 18" are 255 60 18. I believe that both wheel types are identical in overall diameter...

    Absolutely, no 16's here. The smallest size for LR3 is 17"- not availble in US mkt

    After the brief wheel planning, the trip is on-hold for a few months.

  8. #8
    Join Date
    Sep 2009
    Location
    Central Florida
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    Check tire diameters here: http://www.net-comber.com/tirecalc.html

    As long as they are close you'll be fine. Those two sizes are both 30.04" so you're fine.
    Ryan
    '08 Nissan Frontier Nismo 4x4 CC
    3" OME/Bilstein suspension lift, 2" body lift
    35" Goodyear MTR's
    custom rock sliders
    Hefty Fab Works Skid plates & winch bumper
    XRC8
    Lokka front locker, factory electric rear locker

  9. #9
    Join Date
    Oct 2009
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    J10 M40 Oxfordshire UK
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    the size given was just a format example (eg)

    as mentioned in subsequent post with your sizes given there is no substitution problem
    1986 110 CSW TDi6
    1992 90 300tdi auto
    2001 Freelander TD4 Auto

  10. #10
    Join Date
    Jan 2007
    Location
    Eddy, TX
    Posts
    653
    Not sure if realavent or not but my new F250 came with 20" rims from the factory. I ran over a screw and had a slow leak. Took it off and put spare on to get it fixed. The spare was from factory and on a 19" rim I did not realize that until I swapped them.

    I kind of complained to the dealer and he said that was normal and I would have no issue running the spare. I'm not sure of outside diameters... but all was fine until switched back.

    Only issue is some how the truck computer knew I had the spare on and kept warning me to fix darn computers

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