aybeesea

My understanding of Physics isn't too bad but I'm afraid you have lost me.

Is it possible to explain the point in some other way?

ABC

Ricracing

Those where 14" 165" if ! do not remember wrong...

Hartsa

I have the sparewheel but due to runflats I lift it off for summer tire period. When putting on the
non runflat winter tires I put the spare wheel back to trunk. Maybe pretty cosmetic thing, but I guess
I am saving a little bit fuel and money... as long as nothing serious happens

Hartsa

KAF

One of the most important factors in precise handling is what is called the 'unsprung weight.' most of the car is suspended on the suspension components which act to dampen movements and can be tuned to give the car it's handling properties.

One area of the car is not supported by the suspension, that being the wheels and brake components. though a relatively small part of the cars overall weight, they have a inordinate amount of effect on the cars handling. For years manufacturers having been trying to reduce the 'unsprung weight' hence alloy wheels not steel.

RFT's are much heavier that normal tyres, as much as +50% or 12 Lbs each in some cases.

I switched from Bridgestone RFT's to Goodyear GS D3's, the improvement in not only the comfort of the ride, but also the handling was remarkable.



Incidentally, did anyone know that the 100 miles at 50mph 'safe driving' ability of the RFTs' only applies to an car with no more than 2 passengers and no luggage?

Got this from an explanatory leaflet at the Dealers. :thumbsdown:

For a car with 4 passengers and luggage a RFT is only good for 30 miles at 50mph.

get the spare wheel and move to non RFT's as soon as your wallet will stand the cost.

Ricracing

A even better question!

Unsuspended weigh consistis of the tyres, wheels, brakes and everything
that moves with the wheel up and down.
Part of the suspension (spring, shocks, help arms) belongs to this mass also.

The smaller this weigh is, the better the tyre itself can follow the roads surface.
(Both the spring and the shock kind of pushes the tyres to the road).

Also the heavier tyre infects the rotation force, needs more power the get the
heavier mass to rotate and of course to stop rotating.
(Try a carrousel).

I.e. all racing cars do not have wider tyres than are needed and the rims
are made of magnesium or even more futuristic (light) materials.

aybeesea

OK I translate that into Physiscs I understand as Moment of Intertia... "The moment of inertia of an object about a given axis describes how difficult it is to induce an angular rotation of the object about that axis"

Thank you

ABC

KAF

Can we settle for 'Heavy Tyres Suck !

aybeesea

But apparently not in the boot(trunk)...



ABC

Ricracing

Should I and KAF take this for a :thumbsdown: or