Tires & RPM's

Discussion in 'General RVing' started by Mikey_likes_RVing, Mar 19, 2008.

  1. Mikey_likes_RVing

    Mikey_likes_RVing New Member

    I need to buy new tires soon for my F-250 gasser and was curious if anyone knew how much the rpm's would change if I went to a bigger tire. I currently run 235/75R16 and am thinking of going to a 285 or 295/75R16. I have asked different tire dealers and they cant give me a straight answer. I don't know if there is an answer out there or not but i just don't want to find out the hard way.
    Thanks for any info,
    Mike
     
  2. rjann

    rjann New Member

    Re: Tires & RPM's

    You will probably invalidate the warranty on your F250 if you use a different tire from those specified in the owner's manual. It changes more than the rpm's. Just a thought. If you don't care about the warranty, then go with it. I've done that with a pickup truck briefly and it worked fine.
     
  3. screamineagle

    screamineagle New Member

  4. hamdave

    hamdave New Member

    RE: Tires & RPM's



    I need to buy new tires soon for my F-250 gasser and was curious if anyone knew how much the rpm's would change if I went to a bigger tire. I currently run 235/75R16 and am thinking of going to a 285 or 295/75R16. I have asked different tire dealers and they cant give me a straight answer. I don't know if there is an answer out there or not but i just don't want to find out the hard way.
    Thanks for any info,
    Mike



    Mike, I am pretty sure, when you change from a section width of 235 mm to 285 mm that is 50mm (about 2 in). You have to be very careful that on the duals that the tires don't rub each other. You may have to have different rim setup also. I would be very careful about that big of a change. I would expect the diameter (etc, rev/mile) would also have to be checked. As stated by others, you could be way off on your odo reading after such a change, and it may affect the hp/torque curve of where your rig operates as referenced to engine/tranny/drive-train.



    good luck !!
     
  5. Mikey_likes_RVing

    Mikey_likes_RVing New Member

    RE: Tires & RPM's

    Thanks for all your replies. I have sent an email to Ford & Goodyear asking for their opinion/fact but for the time being it looks like I will stay with stock size.
     

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