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LIGHTWEIGHT= PERFORMANCE

Reducing the wheel mass does not only mean reducing the vehicle total mass: it mainly means reducing the unsprung mass. Lower weight of the unsprung mass ensures better tyre grip on the road surface.

If we consider that inertia is the tendency of a body to keep its equilibrium of rest or motion, the following conclusions ensue:

LOWER UNSPRUNG MASS = LESS INERTIA =
better response of shock absorbers, improved comfort, higher driving pleasure
better rotation inertia, hence improved performance in acceleration and braking
improved global vehicle performance
reduced fuel consumption.