They allow for a 16.3-kilogram total drop in unsprung weight
. Mounted on floating aluminum billet center bells, the new rotor and oversized caliper setup is finished off by new, specially formulated brake pads that generate higher friction levels across the full operational range.
While having the motor in the wheels means that there is a lot of unsprung weight
, Hemphill points out that as this is a low-speed urban vehicle, that isn't an issue: "If you have a vehicle trying to do high-speed handing maneuvers, the mass of the wheel motor can interfere with the ability of the suspension to keep the wheel pushed down against the pavement, but in low-speed driving, that's not an issue."
Between the wheels, brake rotors and calipers, the Track Edition boasts a significant 55-pound reduction in unsprung weight
on the front of the car alone.
Small wheels are lighter which means less unsprung weight
. But the ride over bumps at lower speeds isn't brilliant on the 19in wheels and I suspect it would be even worse on the bigger ones.
Two new designs of ultra-lightweight aluminium alloy wheels - 10-spoke as standard and a 5-spoke alternative as a [pounds sterling]4,080 option - are the lightest wheels ever fitted to a Sports Series, the reduction in unsprung weight
bringing a noticeable benefit to the dynamic qualities of the car.
Though OEMs are committed to using iron discs, would they at least address the unsprung weight
by using aluminum in the calipers?
crucial unsprung weight
that is essential to offering a more direct feel through the steering as well as reducing the neces- sary pedal travel.
With a reduced unsprung weight
, Porsche says the tyres trail the surface of the road better and are perfectly optimised for absorbing longitudinal and lateral forces.
However, because the component adds to a car's unsprung weight
, reducing weight was desirable.
The main disadvantages of a standard wheelset are significant unsprung weight
(1500 [??] 5000 kg) acting on the contact wheel-to-rail surfaces and the rigid connections concerning the coordinate rotation between points on the surface of wheels between the coordinate points of rotation of the wheel contacting with surfaces of rails [1, 2].