Four Wheel Logic

Do Bigger Tires Make Your Speedometer Faster or Slower? | What Changes

Larger-diameter tires make the speed display read lower than your true road speed, while smaller tires make it read higher. Bigger tires don’t make the speedometer itself run “faster.” They change how far the vehicle travels in one wheel turn. That’s the whole story. When the tire’s overall diameter grows, each rotation covers more ground.

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