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There are several reasons for not filling tires (tyres Br.) with water.

  1. mass. the mass of the water is great so when the tire rotates if it were filled with water there would be a great gyroscopic effect and a great inertia that would have to be overcome if you were to turn.
  2. compressibility. Water can not be compressed (at least not measurably with the forces applied in daily life) so all deformation of the tire would have top be taken up in the rubber of the tire walls - tires are not made with this in mind (they could be but are not presently). You want a medium that is compressible so that the deformation of the tire will be appropriate to carry the load applied.
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14y ago

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