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Suspension, Brakes and Tires Discussion, Tires in Item Specific Cadillac Discussion; Our 76 Calais calls for 235-75 R15 tires. We have a chance to pick a bargain pair of 225-70 R15. ...
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    Mackenzie is offline Cadillac Owners Member
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    Tires

    Our 76 Calais calls for 235-75 R15 tires. We have a chance to pick a bargain pair of 225-70 R15. Does anyone know if there is any problem putting these on the car?

    Thanks in advance,
    Bob

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    catbert's Avatar
    catbert is offline Cadillac Owners Fanatic
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    Re: Tires

    Quote Originally Posted by Mackenzie
    Our 76 Calais calls for 235-75 R15 tires. We have a chance to pick a bargain pair of 225-70 R15. Does anyone know if there is any problem putting these on the car?

    Thanks in advance,
    Bob

    Rule of thumb - never go down in size, but to make sure, check the load rating of the specific tire.

  4. #3
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    Katshot is offline Cadillac Owners Master
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    Re: Tires

    Anytime you want to change tire size, I would suggest going to http://www.tirerack.com
    and checking the tire dimensions first. Off the top of my mind, I would say that your tire choice should be fine but remember that the 70's will be a little lower (smaller diameter) , but wider, so the wheel wells will seem even LESS filled-up with the 70's.
    I used to do the "75-series" to "70-series" swap on ALL my cars but I also made sure to "fill them wheel wells" by staying with the same (or larger) first number. (example: stay with the 235's and don't drop to a 225)

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    Mackenzie is offline Cadillac Owners Member
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    Re: Tires

    Quote Originally Posted by Katshot
    Anytime you want to change tire size, I would suggest going to http://www.tirerack.com
    and checking the tire dimensions first. Off the top of my mind, I would say that your tire choice should be fine but remember that the 70's will be a little lower (smaller diameter) , but wider, so the wheel wells will seem even LESS filled-up with the 70's.
    I used to do the "75-series" to "70-series" swap on ALL my cars but I also made sure to "fill them wheel wells" by staying with the same (or larger) first number. (example: stay with the 235's and don't drop to a 225)
    Thanks guys. Just so I am clear...if we drop from 235/75/15 to 235/70/15 this will work fine...in otherwords, will it effect the ride, safety or tread life.

    Thanks,
    Bob

  6. #5
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    Katshot is offline Cadillac Owners Master
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    Re: Tires

    Quote Originally Posted by Mackenzie
    Thanks guys. Just so I am clear...if we drop from 235/75/15 to 235/70/15 this will work fine...in otherwords, will it effect the ride, safety or tread life.

    Thanks,
    Bob
    That depends more on the tire type, and manufacturer than the size (especially only changing just one size).
    The size change will provide you with a slightly lower profile, but slightly wider tire. Generally this slight size change will not give you a problem. All things being equal, the ride MAY end up being slightly firmer with the added benefit of better handling.

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    Elvis is offline Cadillac Owners Master
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    Re: Tires

    NEVER drop a size with that first number. Dropping a size with the second number might give you a rougher ride.

  8. #7
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    HotRodSaint is offline Cadillac Owners Master
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    If it's a deal, go ahead and do it.

    And here's two great tire sizing sites to help with these questions.

    http://amsoft.ru/tiresize/index.html

    http://www.geocities.com/xtremephoenix/tire.htm

  9. #8
    Mackenzie is offline Cadillac Owners Member
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    Re: Tires

    Quote Originally Posted by Katshot
    That depends more on the tire type, and manufacturer than the size (especially only changing just one size).
    The size change will provide you with a slightly lower profile, but slightly wider tire. Generally this slight size change will not give you a problem. All things being equal, the ride MAY end up being slightly firmer with the added benefit of better handling.

    Thank you Kevin, I appreciate your advice.
    Bob

  10. #9
    Katshot's Avatar
    Katshot is offline Cadillac Owners Master
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    Re: Tires

    Quote Originally Posted by HotRodSaint
    If it's a deal, go ahead and do it.

    And here's two great tire sizing sites to help with these questions.

    http://amsoft.ru/tiresize/index.html

    http://www.geocities.com/xtremephoenix/tire.htm

    Nice sites

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