|
some old metrics from Pirelli
Long ago and far away, CAR and DRIVER did a pretty big piece on tire tech, citing data shared by Pirelli Tire Co..
Rolling resistance would be be affected by:
* pressure
* velocity
* load
* traction rating
* rubber hysteresis
* sidewall flexure
* number of plies
* diameter
* slip angle
* tread width
* rim ( wheel ) width
* tread-block transverse hinging
* tread design
* sidewall aspect ratio
* Ply construction
* contact patch lengthening in proportion to load.
* contact patch lengthening as an inverse proportion to the square root of the inflation pressure.
* R-R proportional to the product of the mean ground contact pressure and the distance of the center of pressure from the geometrical center of the contact area.
*presence of longitudinal ribs or not ( 'quiet bands' ).
* ambient temperature.
* 70-degrees F is considered 'COLD.'
* LRR is structurally limited to a degree, due to EPA regulated noise criteria, which limits a weighted sound pressure level tires can legally generate while on public roadways.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
|