Tire and Rim opinion

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  1. Endangered Species

    Endangered Species Well-Known Member

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    Since I can't get a 4.30 gear. I may have to change tires.
    Right now I'm running Phoenix 29.5x10.5-15with 10" Rims

    Has anyone run 31X10.5 - 15's with 10" Rims? Phoenix recommends 12"

    The section width goes from 13.0 to 14.7

    Or I could put a 4.11 gear in the car and use a 28" tall tire.
     
  2. 33 IMP

    33 IMP Well-Known Member

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    Are you sure you are not looking at 31x10.5W ? (NOT meant as an insult, that kind of section increase implies a W to me)
    That said, ive never used either size, but if it really has a 10.5 tread, i wouldn't worry a second about a ten inch rim. The tread would be flatter on a twelve, however.
    Edit; this IS only an opinion, but thats what you asked for, lol.
     
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    • Endangered Species

      Endangered Species Well-Known Member

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      Sorry, you are correct...it's a 10.5 W and the tread width goes from 10.7 to 11.7.

      Thanks
       
    • 33 IMP

      33 IMP Well-Known Member

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      Mickey makes a 10.5x33, if you have the room for that height . But that "10.5" has 11.2 tread on the ground. 4.56s?
       
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      • Endangered Species

        Endangered Species Well-Known Member

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        You know... I don't think the 33's will fit, but I see they have a 31 10.5W... I ran the math and with the 4.56 I have now, it will put me at 6875 RPM at the traps which is close enough to my target which is 6800. lol

        I wonder why Mickey's recommend 10" rims and Phoenix recommends 12"....

        You may have pointed me in the right direction, Thanks 33!
         
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        • Budnicks

          Budnicks You Can Just Thank Me Later FBBO Gold Member

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          let me see if I still got this right

          IIRC

          the narrower wheel will just affect the sidewalls/cross sections
          might give it a tad bit more rollout/taller, lil' less contact patch (? if any)
          lil' bit less air/psi, will compensate
          & cross-section mainly, the contact patch won't be affected much
          using a 10" wheel/rim vs a 12" wheel/rim

          we use to go with the wider wheel/rim to calm down a tire
          not wrinkle so much, sort of rides on the outer portions of the tire more too
          usually can handle a lil' more psi too
           
        • 33 IMP

          33 IMP Well-Known Member

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          Seems right to me, Budnicks.
          The really fast guys using the "big" small tire drag radial pro, are using a 14" rim with a 315 tire. (Somewhere near 11" on the ground). I think it gives a better contact patch, with less "bow" in the tire with the amount of air pressure they want to run. I have some 315 dr pro's, but on 12" (dont make anywhere near enough power for 14s) and i want to a-b test them against my hoosier quick time pros that are on my 14s.

          20190604_131421.jpg
           
          Last edited: Mar 29, 2021
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          • khryslerkid

            khryslerkid FBBO Gold Member FBBO Gold Member

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            • 383man

              383man Well-Known Member

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              I run 4.30's in my 8-3/4 rear and use Hoosier 30 x 9 radial slicks. Course my 63 is a street car that I race in full street mode through the full exh. I drive the highway like this turning about 3000 rpm at 60 mph. But I like the 4.30's with a 30" tall tire as my car weighs 3700 lbs without me in it and has run 10.70's. I honestly think it may go faster with 4.10's as I shift around 6200 and trap about 6400. And my eng is a mild 493. It feels like it almost peaking at the traps so that why I think it may pick up a little dropping the gear a tad. But I would have no problem running 4.10's with a 28" tire or even 3.91's. Good luck what ever you decide. Ron
               
            • Endangered Species

              Endangered Species Well-Known Member

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              Thanks guys!
              I did end up finding a US Gear 4.30 Pro gear at Drive Train Specialties. They had a couple left... I debated weather to get it or not since I'm going to go with the 31x10.5 tires... I decided to grab it while the getting was good. If I don't use it, then I'll just sell it.
              Service was super good with them except they did bang me $45.00 to ship a 18lb package from Indiana to the Pennsylvania - Ohio boarder. :mad:
               
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              • dvw

                dvw Well-Known Member

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                My 10.5Wx31 M/T's have been on 10" rims since day one. Last time out it went 1.261 60ft.
                Doug
                 
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                • 6PKRTSE

                  6PKRTSE Well-Known Member

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                  I run 10.5W's and 315's D.R.'s on 12" wheels. It definitely helps stretch the width.

                  20190531_204436.jpg 100_1663.jpg
                   
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                  • Endangered Species

                    Endangered Species Well-Known Member

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                    Right no guys... Thanks!!

                    I'm going to go with the Mikey's 31x10.5's.
                    I'm jus going to have to use some spacers to get the clearance I need for now until I get new rims with the off set I need.
                    If I get new rims, I'm may still end up with 10" rims because the old school rims I want don't seem to come in 12".
                     
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