Manual Transaxle Tires and Disc Wheels 2 of 2
(3) Rib-and-lug pattern
This pattern combines the rib and lug patterns to provide stable driving performance on both paved and unpaved roads.
The rib pattern running along the center of the tire stabilizes the vehicle by minimizing tire side-slipping, while the lug pattern on the edges of the tire enhances driving and braking performance. The lug portion of the pattern is more susceptible to uneven wear.
(4) Block pattern
In this pattern, the tread is divided into independent blocks. Used on most snow tires and studless tires, the block tread pattern is now coming to be used on radial-ply tires for passenger cars as well.
The block pattern provides better driving and braking performance.
The block pattern reduces slipping and skidding on muddy or snow-covered roads.
ο€ The tires tend to wear faster than those with the rib and lug patterns.
Rolling resistance is slightly greater.
The tread is susceptible to unusual wear, especially on hard surfaces.
Unidirectional Pattern Tires
These are tires with a tread pattern, which has directionality with respect to the direction of rotation. Lateral grooves in the tire tread are given directionality in order to improve performance on wet roads, making it easier for the tires to drain off water. The performance of these tires on wet roads worsens if they are mounted in the wrong direction.
2. Pattern noise
Pattern noise is the most distinctive operating sound of the tire. The tread grooves coming into contact with the road surface contain air, which is trapped and compressed between the grooves and the road surface. When the tread leaves the road surface, the compressed air bursts out of the grooves, generating noise. Pattern noise increase if tread design is such that air is more liable to be trapped in the grooves.
The block or lug tread pattern, for example, is more likely to generate noise than the rib pattern. The pitch (frequency) of the noise rises as the vehicle speed increases. Since pattern noise thus depends on tread pattern, the pattern can be designed to minimize this. What appears to be a simple repetitive lug and zigzag pattern, for example, may contain subtle variations in pattern spacing.
