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Informal Range Poll: Uncovered Aero vs. Sport

Discussion in 'Tech Talk' started by Rich M, Sep 27, 2017.

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Which wheel/tire combo is most efficient overall?

This poll will close on Oct 27, 2017 at 10:07 AM.
  1. 18" Aero with no cover

    69.2%
  2. 19" Sport

    30.8%
More threads by Rich M
  1. Rich M

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    So what do you think will provide the least rolling resistance and/or most range: 18" Aero wheels with no covers and Michelin MXM4 tires vs. 19" Sport wheels with ContiProContact tires. They look to be the same width, with the 18" tire being 45 series and the 19" being 40 series. Both look to be classified as Grand Touring.

    My guess is that the Uncovered Aeros still win at all but high speeds. Of course without a Mythbusters budget, we'll never know. But this forum is built on speculation!
     
  2. MelindaV

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    Im going with the sport wheels as the uncovered aero wheels are so spindly, visually they look like they would cause more turbulence, regardless of the tire used or difference between 18/19" size.
    maybe @KarenRei has some opinion to add :)
     
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    • SSonnentag

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      I'm going with insignificant differences, as in, not able to determine due to such a small difference and so many other variables.
       
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      • garsh

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        I think the 18's are not quite as wide, and they weigh less, so they'll continue to provide better efficiency.
         
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        • KarenRei

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          In general you'd expect the 18s without covers to have less resistance - but you can't say for sure without either testing or a good CFD setup, as the shape of the rims is different for both vehicles.
           
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          • Rich M

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            I think they're both 235
             
          • SoFlaModel3

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            I think it’s the 18s, but that won’t stop me from getting the 19s ;)
             
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            • garsh

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              Tire sizes are notoriously "approximate". ;)
               
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              • Michael Russo

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                18s? What 18s??? :D
                 
              • SoFlaModel3

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                Go big or go home ;)
                 
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                • garsh

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                  ...because the big wheels won't have enough range to make it home?
                  <rimshot>
                   
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                  • Dogwhistle

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                    The uncovered Aeros still look cheesy, and I don’t care for the Brakedust Grey finish. I bet the Sports are more efficient due to the spoke shape.
                     
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                    • arnis

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                      Rolling resistance for these two (if tire compound WOULD be the same) would be pretty much the same.
                      What is different is aerodynamic drag. Wheels ruin the airflow. Therefore range will drop at higher speeds.
                      Both wheels look not good, though 18" have more slippery tire sidewall, less spokes, and sit closer to brake disc edge.
                      19" on the other hand try to be turbine shaped. Though visually they are still far from slippery.
                      All Model 3's will have air curtain airflow around front wheels (inlets are right next to fog lights). That will help both versions.
                       

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