See this tire? This is one of the tires my car came with.

And you may note the size is 175/65r15

That is not the stock size.

Stock apparently is 195/55r15

I discovered this when I was doing some preliminary tire and wheel research as I’ll have to replace these tires before next winter.

This size discrepancy means (based on a tire size calculator) the circumference of my tires are 2-3 percent bigger than OEM.

This also means when I drive, my speedometer shows a speed that is a little slower than I’m actually going. I confirmed this today with a GPS-based speedometer app on my phone.

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Aaaand... this also means my MPG figures are being reported 2-3 percent lower than they should be since I’m covering more distance than what the odometer indicates.

((Sidenote: recently made a new fuel economy record on a recent tank... 5.3L/100km... and that’s before adjusting for the oversized tires)

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And finally... it also has the effect of making my car a little slower to accelerate.

So now I’m thinking that when I replace my tires, I’ll also replace these crappy steelies with crappy plastic covers (which clearly didn’t come off of a Fit) with some used 14” OEM alloy wheel with a tire size much closer to stock.

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I might go with the 14” alloy wheels Accords or Preludes had in the 1990s. I already checked and confirmed there are some available at boneyards local to me.