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Home Blog Blog wheel/tire size

wheel/tire size

This topic contains 13 replies, has 4 voices, and was last updated by  62cutlassconvert 2 weeks, 3 days ago.

Viewing 10 posts - 1 through 10 (of 14 total)
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  • #14117

    bartmo
    Participant

    Will 205/75r15 tires on 6 inch wide wheels with 3.625 backspace fit OK on 62 cutlass?

    #14118

    62cutlassconvert
    Participant

    I don’t know if it will fit but IMO it’s too big anyway. That’s over 27 inches. I am running a 205 65 15 which is about 25.5″, about the diameter of the original 15″ option. The 13″ rims ran even smaller tires. The side wall on a 205 75 is going to be very high and it will roll a lot resulting in poor handling. More like a small truck tire. Of course the large diam also effects your gearing. Check out a calculator on line and you will see how it changes your gearing. Your backspacing is okay I think but might be moving the wheel in a little too much. Lots of info on tires and wheels in the forum. Use the search all the way at the bottom of the page to do some searches.

    #14119

    bartmo
    Participant

    Thanks 62 convert

    #14129

    joe_padavano
    Participant

    I can tell you from first-hand information that 205/70-14 on 6″ wheels fit. I can also tell you first-hand that 215/60-15s on stock 15″ wheels fit. Both of those combos are about 25.25″ in diameter. Your 205/75-15s are about 27.1″ in diameter. Those would be a good choice for a 1968-72 Cutlass, but are waaaay too tall for the 61-63 cars.

    #14130

    captiannapalm
    Participant

    i have 205/55zr16 bfgs on 7″ rims……sit perfect height wise……width….had to use wifes hair dryer and bfh for the lip on the rear quarters..

    #14133

    joe_padavano
    Participant

    205/55-16s are a Honda-sized 24.8″ in diameter.

    #14134

    captiannapalm
    Participant

    So was the stock size replacement of 180/85/13 …these are 25″

    #14141

    joe_padavano
    Participant

    The stock tire size on 62 Jetfires and convertibles was 7.00 x 13, which was 25.8″ diameter. The fact that some vendor (who is not Oldsmobile) claims that 180/85-13 is the replacement tire doesn’t mean that it’s correct or even the same size as original.

    #14142

    bartmo
    Participant

    Thanks for the replies.
    215/60r15 is the size preferred. Problem is, I haven’t found narrow whitewalls in this size except Cooker and other vintage tire suppliers and am reluctant to pay $200-$300 per tire

    #14143

    62cutlassconvert
    Participant

    Really should be running 6.5″ or wider rim for 215 tires. Bulging side wall will result in poor handling with a lot of side wall roll, poor steering response … 205 is about it for 6″ rims. People do run wide tires on skinny rims but you sacrifice proper performance.

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