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.
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)
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.
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.