How much does tire weight matter?

A lot for its size, because it is unsprung and rotating. Weight at the tire behaves like roughly twice its mass under acceleration, so a few pounds per tire is felt in acceleration, braking, and ride.

Is one pound at the wheel really ten pounds?

That saying is exaggerated. The defensible figure is that a tire behaves like about 1.6 to 2 times its static weight under acceleration, because its mass sits out at the rim like a hoop.

Do heavier tires hurt MPG?

Modestly. Heavier, more aggressive tires add rolling resistance and rotating mass, which is part of the 1 to 3 mpg loss owners see moving to larger off-road tires.

Tire weight

Compare Tacoma tire weight and its effect.

Enter current and new tire weights to see the total added mass and its rotational acceleration effect.

In short

Compares two tire weights and the total change across four wheels.

Weight at the tire behaves like a hoop, so its acceleration effect is roughly twice its static mass.
Heavier tires hurt acceleration, braking, ride, and MPG more than the same weight in the body.

Tire weights

Weight of each tire and how many wheels.

Current tire weight (lb)

New tire weight (lb)

Wheel count

+40.0 lb across 4 wheels

Each new tire adds 10.0 lb of unsprung, rotating weight.

Per-tire change: +10.0 lb
Total across 4 wheels: +40.0 lb
Rotational equivalent / tire: +20.0 lb
Rotational across 4 wheels: +80.0 lb

Weight at the tire behaves like about 1.6 to 2 times its mass because it sits out at the rim like a hoop and has to be spun up as well as carried along. That is why the same weight added at the tire hurts acceleration, braking, ride quality, and MPG far more than adding it to the body of the truck.

What it does

How this tool helps.

Weight change

Total static weight difference across all four tires from a size or load-range change.

Rotational effect

Weight at the tire behaves like a hoop, so its acceleration effect is about twice its static mass.

What it costs you

How added tire weight affects acceleration, braking, ride quality, and fuel economy.

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