Tire Size vs. Wheel Width ?

Tires and Wheels (Mopar Hubcaps Too)

  1. RPMagoo

    RPMagoo Just An Old Motorhead

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    The Tire Manufacturers indicate that with a 295/50-15" tire, the minimum wheel width is 8 inches. -- This seems too narrow for a tire of that size. -- Has anyone done that, and/or comments ? --- Thanks
     
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    • toolmanmike

      toolmanmike FABO Staff Staff Member FABO Gold Member

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      Section width is 11.6". They recommend 8-10.5" wheel width. Yes I think the 8" is too narrow.
       
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      • rumblefish360

        rumblefish360 so close yet so far away

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        I try to run with the wideset wheel for the tire used. This keeps more tread on the ground and less stress on the tire mounted to the wheel so it doesn’t bulge. A narrower wheel may work but I don’t like it.

        The same is also true in reverse. I don’t like to stretch the tires ability to seal against a wide wheel.
         
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        • famous bob

          famous bob mopar misfit

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          ;
          Agree with the above posts, but I have been running 296 65 15 d.radials on 8" prostars. need to let a little more air out of them---------
           
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          • TrailBeast

            TrailBeast Slightly Twisted Member

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            Totally agree with your thoughts on that.

            245/40's on 9.5 wheels
            Section width of the tire is 9.5 inches.
            I wanted as much rim as I could get and as far out to the fender as I could get it.
            After moving the leafs 1/2 inboard I have 1" on each side of the tires inside the fenders after trimming 1/2 off the inside lip, and 1/2 inch from the rim/tire to the springs.
            Probably could have done 255's but didn't want to push my luck.

            Of course it took me months of investigation and surfing the tire and wheel places before I felt ready to commit that much money to something I couldn't physically try on the car first, but in the end they fit perfect.:D
             
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            • steve340demon

              steve340demon Active Member

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              C364D1B5-56B6-42B0-AB95-EC8454DE521A.jpeg
              This is 295/50R15 BFG Radial T/A on 15x8 rally wheel
               
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              • leblanc

                leblanc member 2883

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                Go with the widest recommended or add at least 1/2 inch.
                 
              • GMachineDartGT

                GMachineDartGT Senior Member

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                Do you have a shot of this?
                Seems like a narrow tire. My Scat Pack came with 275s on 9.5s. My Dart is 275 35s on 9s.
                 
              • TrailBeast

                TrailBeast Slightly Twisted Member

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                Different years and models have different wheel opening sizes and I measured very closely before ordering.
                The 73 Dart Swinger doesn't have the room some of the other cars do.
                I can get a very specific pic/s if I know where specifically you would like to see.
                I have these right now.

                outside.jpg

                under.jpg
                 
              • YY1

                YY1 Well-Known Member

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                I've got 255/60/15 on 6.5" rallye's.

                They look like they were designed to be together.

                However, I also have 235/60/14 on 5.5" rallyes, and I won't do that again.
                 
              • GMachineDartGT

                GMachineDartGT Senior Member

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                275s on 9s

                20180729_152800.jpg

                20180722_202058.jpg
                 
              • famous bob

                famous bob mopar misfit

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              • GMachineDartGT

                GMachineDartGT Senior Member

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                I had the fenders removed and stored while I repaired the front structure and repainted the engine compartment.

                20180720_172204.jpg

                20180427_013614.jpg
                 
              • famous bob

                famous bob mopar misfit

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              • MRGTX

                MRGTX Well-Known Member

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                I have to say that the tires on @steve340demon 's car look pretty badass but yeah, I think the general consensus is right on in this thread. 8" technically will hold a 295 tire but you're far from the optimal contact patch, meaning that you're accelerating a bunch of tire mass that you're not putting to good use.

                To some degree this is going to depend on the intended use and the design of the particular tire. Personally, I'd want a 10" wide wheel before I even thought about a 295. I am running a square 285/35/19 setup on my Mustang with 9.5" wide wheels. The sidewalls are holding up, the tread is wearing pretty well...but even this is technically less than ideal.

                Bridgestone RE-11 18k miles.jpg
                 
              • famous bob

                famous bob mopar misfit

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                Like I said , I agree with all the above posts , but they are radials and have flexable sidewalls to start with, letting a little extra air out of them to get the contact patch flat on the ground aint that big a deal. " If ur not trying to make a corner carver out of it "------
                I`m thinking seriously about putting the 295 60 15 d.r. back on my 68 fastback, cant find anything much better (bigger) that I can get under it, being non tubbed. Really would like to have sticky tread tho. Been looking at 295 60 d15 hoosier quick times, but don't think the sidewalls would clear, as they are wider than my 295 drag radials.
                 
              • MRGTX

                MRGTX Well-Known Member

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                Yeah, if you're not trying to make a corner carver out of it, I guess you have a few more options. I believe that drag radials in particular are more accommodating to playing with the tire pressure...though I've never owned a set so I'm just going on what I've been told.

                Otherwise, you might be ok for accelerating and braking but if you need to steer hard, you're certainly going to notice those squirming tires.

                Why not spend a few bucks and get wheels that can take advantage of the extra surface area?
                 
              • steve340demon

                steve340demon Active Member

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                Ya there is no doubt that they should be on 10” rim, but I had to squeeze these 295s in there on 8” with spring relocate and I wanted them inside wheel lip.. as for handling these A bodies never handled with stock suspension.. this is jus cruiser with 340 4 speed with big boots on back if know what mean
                 
              • famous bob

                famous bob mopar misfit

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                sidewall would clear!
                Same here . Altho I wouldn`t exactly call mine a cruiser. Its a toy.
                 
              • steve340demon

                steve340demon Active Member

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                View attachment 1715288349

                Side would clear wheel lip mean?
                 
              • famous bob

                famous bob mopar misfit

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                I don't agree about A bodies not handleing. In 1968 I bought a new 383 fomula S fastback, I bought it in Tulsa, drove it home on the hi way, around the small hick town I lived outside of that night, (lot of dragging main) , a little showing off.
                The next day I took off to return o the air base I was stationed at. I got into a race w/ a volkswagwn and a new camaro that they , (GM commercials) , called the "hugger" that year.
                We were racing thru the Ozark mpountains , before interstate 40 was done back then. I could run of and leave them both w/o much trouble !
                I had to laugh everytime I saw that GM commercial.
                 
                Last edited: Feb 13, 2019 at 7:29 AM
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                • YY1

                  YY1 Well-Known Member

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                  Mopars in general in the 60's and early 70's with their torsion bar suspension handled better than almost any contemporary car in a similar price range.

                  I routinely out-handled current model 80's and 90's mustangs and camaros in my 20 year old 1970 Super Bee.
                   
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                  • MRGTX

                    MRGTX Well-Known Member

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                    I get your point about a VW being a light weight, relatively nimble car for it's day but I have to admit that the thought of comparing a VW against a big block A-body is mildly hilarious. :D
                     
                  • famous bob

                    famous bob mopar misfit

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                    stback
                    May be so, but he was ahead of the camaro !!
                     
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