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jmckelvy's avatar
jmckelvy
Explorer
Dec 20, 2014

RAM Dually Tires-New Tires

I will soon need to replace the Cooper Discoverer AT3 tires on my truck. I would like to go to a slightly wider tire, LT245/75 R17 rather than the current stock LT235/80 R17.

The 245s have a slightly higher load rating and are actually a little less pricewise than the 235s. My concern is keeping the rear tires from "kissing" when my truck camper is loaded. It appears that there is enough clearance so this won't happen but I want to be positive before dropping the better part of $1500.

Anyone with a RAM dually run (no spacers) this size tire without any issues?
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6 Replies

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  • eHoefler's avatar
    eHoefler
    Explorer II
    Dec 21, 2014
    I have run the 245/75r17 HT Coopers on all my Ram DWR. The are closer in physical size to the stock Generals that came on the trucks.
  • glazier's avatar
    glazier
    Explorer II
    Dec 21, 2014
    I have always run stock width on my dual wheel trucks for the reason you mentioned.
  • The_Mad_Norsky's avatar
    The_Mad_Norsky
    Explorer
    Dec 21, 2014
    Actually, not by that much.

    235/80/17's are 9 inches section width

    255/80/17's 10.2

    245/75/17's 9.4

    Meanwhile you go to a three ply sidewall in the ST Maxx and gain about 8/10 of an inch in tire height.
  • transamz9's avatar
    transamz9
    Explorer
    Dec 21, 2014
    The Mad Norsky wrote:
    :h

    Just thinking that the Rams run with a six inch width rim.

    I don't know if that is actually wide enough to go with the 245.75/17's.

    Another option for you may be to try out the Cooper ST Maxx in 255/80/17. Slightly taller tire, but similar in width to your factory 235/80/17's.


    A 255 is wider than a 245, even wider than a 235.
  • transamz9's avatar
    transamz9
    Explorer
    Dec 21, 2014
    jmckelvy wrote:
    I will soon need to replace the Cooper Discoverer AT3 tires on my truck. I would like to go to a slightly wider tire, LT245/75 R17 rather than the current stock LT235/80 R17.

    The 245s have a slightly higher load rating and are actually a little less pricewise than the 235s. My concern is keeping the rear tires from "kissing" when my truck camper is loaded. It appears that there is enough clearance so this won't happen but I want to be positive before dropping the better part of $1500.

    Anyone with a RAM dually run (no spacers) this size tire without any issues?


    The 245's will be just fine on your truck without spacers. ;)
  • The_Mad_Norsky's avatar
    The_Mad_Norsky
    Explorer
    Dec 20, 2014
    :h

    Just thinking that the Rams run with a six inch width rim.

    I don't know if that is actually wide enough to go with the 245.75/17's.

    Another option for you may be to try out the Cooper ST Maxx in 255/80/17. Slightly taller tire, but similar in width to your factory 235/80/17's.

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